# CVE-2026-4878: Libcap: libcap: privilege escalation via toctou race condition in cap_set_file()

Status: published. Published: 2026-04-09. Updated: 2026-11-04.

A flaw was found in libcap. A local unprivileged user can exploit a Time-of-check-to-time-of-use (TOCTOU) race condition in the `cap_set_file()` function. This allows an attacker with write access to a parent directory to redirect file capability updates to an attacker-controlled file. By doing so, capabilities can be injected into or stripped from unintended executables, leading to privilege escalation.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: CNA: redhat)
- fix: RHSA-2026:59831: Red Hat OpenShift Container Platform 4.12

RHSA-2026:26542: Red Hat OpenShift Container Platform 4.13

RHSA-2026:28887: Red Hat OpenShift Container Platform 4.14

RHSA-2026:23233: Red Hat OpenShift Container Platform 4.15

RHSA-2026:25044: Red Hat OpenShift Container Platform 4.16

RHSA-2026:34098: Red Hat OpenShift Container Platform 4.17

RHSA-2026:25181: Red Hat OpenShift Container Platform 4.18

RHSA-2026:23245: Red Hat OpenShift Container Platform 4.19

RHSA-2026:19456: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux BaseOS EUS (v. 10.0)

RHSA-2026:12423: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)

RHSA-2026:19130: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10)

RHSA-2026:21254: Red Hat Enterprise Linux AppStream E4S (v.9.2), Red Hat Enterprise Linux BaseOS E4S (v.9.2)

RHSA-2026:20595: Red Hat Enterprise Linux AppStream EUS (v.9.4), Red Hat Enterprise Linux BaseOS EUS (v.9.4)

RHSA-2026:19458: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6)

RHSA-2026:12441: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9)

RHSA-2026:19346: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9)

RHSA-2026:13285: Red Hat Enterprise Linux BaseOS (v. 8)

RHSA-2026:24346: Red Hat Enterprise Linux BaseOS AUS (v.8.6), Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)

RHSA-2026:22957: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8)

RHSA-2026:39981: Cost Management 4

RHSA-2026:27998: Cost Management 4

RHSA-2026:25096: Red Hat AI Inference Server 3.2

RHSA-2026:30078: Red Hat AI Inference Server 3.3

RHSA-2026:30089: Red Hat AI Inference Server 3.3

RHSA-2026:30088: Red Hat AI Inference Server 3.3

RHSA-2026:30087: Red Hat AI Inference Server 3.3

RHSA-2026:14937: Red Hat Discovery 2

RHSA-2026:29197: Red Hat Discovery 2

RHSA-2026:7473: Red Hat Hardened Images

RHSA-2026:22634: Red Hat Insights proxy 1.5

RHSA-2026:14162: Red Hat OpenShift distributed tracing 3.9.3

RHSA-2026:58981: Red Hat Update Infrastructure 5

RHSA-2026:21275: Red Hat Update Infrastructure 5 (source: ADP: redhat-SADP)
- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (source: ADP: redhat-SADP)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (libcap): ≥ 0:2.69-7.el10_1.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (libcap): ≥ 0:2.69-7.el10_2.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support (libcap): ≥ 0:2.69-7.el10_0.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (libcap): ≥ 0:2.48-6.el8_10.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (libcap): ≥ 0:2.48-4.el8_6.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (libcap): ≥ 0:2.48-4.el8_6.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (libcap): ≥ 0:2.48-5.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (libcap): ≥ 0:2.48-5.el8_8.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libcap): ≥ 0:2.48-10.el9_7.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libcap): ≥ 0:2.48-10.el9_8.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (libcap): ≥ 0:2.48-9.el9_2.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (libcap): ≥ 0:2.48-9.el9_4.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (libcap): ≥ 0:2.48-9.el9_6.1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.12 (openshift/ose-rhel-coreos-8): ≥ 412.86.202608241157-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.13 (openshift/ose-rhel-coreos-9): ≥ 413.92.202606160406-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.14 (openshift/ose-rhel-coreos-9): ≥ 414.92.202606231112-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.15 (openshift/ose-rhel-coreos-9): ≥ 415.92.202606030318-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.16 (openshift/ose-rhel-coreos-9): ≥ 416.94.202606051757-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.17 (openshift/ose-rhel-coreos-9): ≥ 417.94.202606250942-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.18 (openshift/ose-rhel-coreos-9): ≥ 418.94.202606051320-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4.19 (openshift/ose-rhel-coreos-9): ≥ 4.19.9.6.202606031700-0; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.17 (cert-manager/jetstack-cert-manager-acmesolver-rhel9): ≥ 1791371080; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.17 (cert-manager/jetstack-cert-manager-rhel9): ≥ 1791371069; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.17 (cert-manager/cert-manager-operator-rhel9): ≥ 1791788287; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.17 (cert-manager/cert-manager-operator-bundle): ≥ 1791970484; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.18 (cert-manager/jetstack-cert-manager-acmesolver-rhel9): ≥ 1791459707; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.18 (cert-manager/jetstack-cert-manager-rhel9): ≥ 1791459711; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.18 (cert-manager/cert-manager-istio-csr-rhel9): ≥ 1791459759; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.18 (cert-manager/cert-manager-operator-rhel9): ≥ 1789029076; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.18 (cert-manager/cert-manager-operator-bundle): ≥ 1791966259; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cert Manager support for Red Hat OpenShift release 1.20 (cert-manager/cert-manager-trust-manager-rhel9): ≥ 1790598593; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cost Management 4 (costmanagement/costmanagement-metrics-rhel9-operator): ≥ 1780946239; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Cost Management 4 (costmanagement/costmanagement-metrics-rhel9-operator): ≥ 1783539156; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AI Inference Server 3.2 (rhaiis/model-opt-cuda-rhel9): ≥ 1780681984; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/model-opt-cuda-rhel9): ≥ 1782352950; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-spyre-rhel9): ≥ 1782352919; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-rocm-rhel9): ≥ 1782353093; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-cuda-rhel9): ≥ 1782352847; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 2 (discovery/discovery-server-rhel9): ≥ 1778101579; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 2 (discovery/discovery-ui-rhel9): ≥ 1778156756; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 2 (discovery/discovery-server-rhel9): ≥ 1782159791; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Discovery 2 (discovery/discovery-ui-rhel9): ≥ 1782166952; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (libcap-main): ≥ 2.78-1.1.hum1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Insights proxy 1.5 (insights-proxy/insights-proxy-container-rhel9): ≥ 1780420428; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI 3.4 (rhai/base-image-neuron-rhel9): ≥ 1790703542; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-collector-rhel9): ≥ 1778056267; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-rhel9-operator): ≥ 1778056233; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-target-allocator-rhel9): ≥ 1778056245; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/cds-rhel9): ≥ 1779798159; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/haproxy-rhel9): ≥ 1779798164; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/installer-rhel9): ≥ 1779798165; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/rhua-rhel9): ≥ 1779798222; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/cds-kubernetes-tp-rhel9): ≥ 1787241211; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/installer-tp-rhel9): ≥ 1787135742; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/rhua-tp-rhel9): ≥ 1787241260; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (compat-libcap1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (libcap): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (compat-libcap1): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (libcap): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-hypershift-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (libcap): ≥ 0:2.69-7.el10_1.1; < * (unaffected, rpm); ≥ 0:2.69-7.el10_2.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support (libcap): ≥ 0:2.69-7.el10_0.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8 (libcap): ≥ 0:2.48-6.el8_10.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (libcap): ≥ 0:2.48-4.el8_6.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (libcap): ≥ 0:2.48-4.el8_6.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service (libcap): ≥ 0:2.48-5.el8_8.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (libcap): ≥ 0:2.48-5.el8_8.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 9 (libcap): ≥ 0:2.48-10.el9_7.1; < * (unaffected, rpm); ≥ 0:2.48-10.el9_8.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (libcap): ≥ 0:2.48-9.el9_2.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 9.4 Extended Update Support (libcap): ≥ 0:2.48-9.el9_4.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support (libcap): ≥ 0:2.48-9.el9_6.1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.12 (rhcos): ≥ 412.86.202608241157-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.13 (rhcos): ≥ 413.92.202606160406-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.14 (rhcos): ≥ 414.92.202606231112-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.15 (rhcos): ≥ 415.92.202606030318-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.16 (rhcos): ≥ 416.94.202606051757-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.17 (rhcos): ≥ 417.94.202606250942-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.18 (rhcos): ≥ 418.94.202606051320-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4.19 (rhcos): ≥ 4.19.9.6.202606031700-0; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Cost Management 4 (costmanagement/costmanagement-metrics-rhel9-operator): ≥ 1780946239; < * (unaffected, rpm); ≥ 1783539156; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat AI Inference Server 3.2 (rhaiis/model-opt-cuda-rhel9): ≥ 1780681984; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/model-opt-cuda-rhel9): ≥ 1782352950; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-spyre-rhel9): ≥ 1782352919; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-rocm-rhel9): ≥ 1782353093; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat AI Inference Server 3.3 (rhaiis/vllm-cuda-rhel9): ≥ 1782352847; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Discovery 2 (discovery/discovery-server-rhel9): ≥ 1778101579; < * (unaffected, rpm); ≥ 1782159791; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Discovery 2 (discovery/discovery-ui-rhel9): ≥ 1778156756; < * (unaffected, rpm); ≥ 1782166952; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Hardened Images (libcap-main): ≥ 2.78-1.1.hum1; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Insights proxy 1.5 (insights-proxy/insights-proxy-container-rhel9): ≥ 1780420428; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-collector-rhel9): ≥ 1778056267; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-rhel9-operator): ≥ 1778056233; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift distributed tracing 3.9.3 (rhosdt/opentelemetry-target-allocator-rhel9): ≥ 1778056245; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/cds-rhel9): ≥ 1779798159; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/haproxy-rhel9): ≥ 1779798164; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/installer-rhel9): ≥ 1779798165; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/rhua-rhel9): ≥ 1779798222; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/cds-kubernetes-tp-rhel9): ≥ 1787241211; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/installer-tp-rhel9): ≥ 1787135742; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Update Infrastructure 5 (rhui5/rhua-tp-rhel9): ≥ 1787241260; < * (unaffected, rpm). Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 6 (compat-libcap1): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 6 (libcap): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 7 (compat-libcap1): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat Enterprise Linux 7 (libcap): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift4/ose-hypershift-rhel9): Version range not reported. Source: ADP: redhat-SADP
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: ADP: redhat-SADP

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:libcap_project:libcap:-:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: CNA: redhat

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: ADP: redhat-SADP

- CVSS 3.1: 7 (high); CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H; source: NVD: nvd@nist.gov

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: NVD: secalert@redhat.com

- CVSS 3.1: 6.7 (medium); CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H; source: NVD: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-04; percentile 10.15%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-367

## Exploit evidence

- exploit: http://www.openwall.com/lists/oss-security/2026/04/09/5 (af854a3a-2127-422b-91ae-364da2661108)
- exploit: http://www.openwall.com/lists/oss-security/2026/04/09/6 (af854a3a-2127-422b-91ae-364da2661108)

## References

- https://access.redhat.com/errata/RHSA-2026:12423 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:12441 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:13285 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:14162 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:14937 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19130 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19346 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19456 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19458 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:20595 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:21254 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:21275 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:22634 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:22957 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:23233 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:23245 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:24346 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25044 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25096 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25181 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:26542 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:27998 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:28887 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:29197 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30078 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30087 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30088 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30089 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:34098 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:39981 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:58981 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:59831 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:72502 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:74674 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:7473 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82304 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82322 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82347 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82354 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82372 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82857 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:82888 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-4878 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2447554 (CNA: redhat)

- https://bugzilla.redhat.com/show_bug.cgi?id=2451615 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- http://www.openwall.com/lists/oss-security/2026/04/07/4 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2026/04/07/14 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2026/04/08/9 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2026/04/09/5 (ADP: CVE)

- http://www.openwall.com/lists/oss-security/2026/04/09/6 (ADP: CVE)

- https://access.redhat.com/security/cve/CVE-2026-4878 (ADP: redhat-SADP; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2451615 (ADP: redhat-SADP; issue-tracking, x_refsource_REDHAT)

- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json (ADP: redhat-SADP; x_sadp-csaf-vex)

- https://access.redhat.com/errata/RHSA-2026:59831 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:26542 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:28887 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:23233 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25044 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:34098 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25181 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:23245 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19456 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:12423 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19130 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:21254 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:20595 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19458 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:12441 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:19346 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:13285 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:24346 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:22957 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:39981 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:27998 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:25096 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30078 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30089 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30088 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:30087 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:14937 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:29197 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:7473 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:22634 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:14162 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:58981 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:21275 (ADP: redhat-SADP; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:12423 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:12441 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:13285 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:14162 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:14937 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:19130 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:19346 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:19456 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:19458 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:20595 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:21254 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:21275 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:22634 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:22957 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:23233 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:23245 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:24346 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:25044 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:25096 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:25181 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:26542 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:27998 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:28887 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:29197 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:30078 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:30087 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:30088 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:30089 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:34098 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:39981 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:58981 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:59831 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:72502 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:74674 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:7473 (secalert@redhat.com; Vendor Advisory)

- https://access.redhat.com/errata/RHSA-2026:82304 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82322 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82347 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82354 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82372 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82857 (secalert@redhat.com)

- https://access.redhat.com/errata/RHSA-2026:82888 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2026-4878 (secalert@redhat.com; Vendor Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2447554 (secalert@redhat.com; Permissions Required)

- https://bugzilla.redhat.com/show_bug.cgi?id=2451615 (secalert@redhat.com; Issue Tracking, Vendor Advisory)

- http://www.openwall.com/lists/oss-security/2026/04/07/14 (af854a3a-2127-422b-91ae-364da2661108; Mailing List, Third Party Advisory)

- http://www.openwall.com/lists/oss-security/2026/04/07/4 (af854a3a-2127-422b-91ae-364da2661108; Mailing List, Third Party Advisory)

- http://www.openwall.com/lists/oss-security/2026/04/08/9 (af854a3a-2127-422b-91ae-364da2661108; Mailing List, Third Party Advisory)

- http://www.openwall.com/lists/oss-security/2026/04/09/5 (af854a3a-2127-422b-91ae-364da2661108; Exploit, Mailing List, Third Party Advisory)

- http://www.openwall.com/lists/oss-security/2026/04/09/6 (af854a3a-2127-422b-91ae-364da2661108; Exploit, Mailing List, Third Party Advisory)

- https://access.redhat.com/errata/RHSA-2026:12423 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:12441 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:13285 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:14162 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:14937 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:19130 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:19346 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:19456 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:19458 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:20595 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:21254 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:21275 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:22634 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:22957 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:23233 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:23245 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:24346 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:25044 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:25096 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:25181 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:26542 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:27998 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:28887 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:29197 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:30078 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:30087 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:30088 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:30089 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:34098 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:39981 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:58981 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:59831 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

- https://access.redhat.com/errata/RHSA-2026:7473 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://access.redhat.com/security/cve/CVE-2026-4878 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Vendor Advisory)

- https://bugzilla.redhat.com/show_bug.cgi?id=2451615 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c; Issue Tracking, Vendor Advisory)

- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4878.json (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-4878; retrieved 2026-11-04; source updated 2026-11-04

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4878; retrieved 2026-11-05; source updated 2026-11-04

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-4878; retrieved 2026-11-04; source updated Not reported

Revision: b1a281e220b14e1b85aa3bcaf302b7435e07368a57c2c71d06903e600236844f

Canonical: https://y2.dev/cve/CVE-2026-4878

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.