CVE-2026-42965
Openshift/router: openshift/router: cloud metadata ssrf via fqdn-typed endpointslice bypasses destination validation
A flaw was found in the OpenShift Router. A user with EndpointSlice write access can exploit this vulnerability by creating a Service backed by an FQDN (Fully Qualified Domain Name) EndpointSlice that resolves to a cloud metadata endpoint. This allows the router to proxy requests to the cloud metadata endpoint, leading to the disclosure of instance credentials and other sensitive metadata. This bypasses previous security measures for validating IP addresses.
Fixes and workarounds
Fix
RHSA-2026:57408: Red Hat OpenShift Container Platform 4.19 RHSA-2026:54583: Red Hat OpenShift Container Platform 4.20 RHSA-2026:54602: Red Hat OpenShift Container Platform 4.21 RHSA-2026:54770: Red Hat OpenShift Container Platform 4.22
Source: ADP: redhat-SADPAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Red Hat OpenShift Container Platform 4.17 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1789938693; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.18 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1788578875; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.19 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786771399; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.20 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786496552; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.21 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786498169; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.22 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786584196; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-haproxy-router
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 5 Red Hat openshift5/ose-haproxy-router-rhel9
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat OpenShift Container Platform 4.19 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786771399; < * (unaffected, rpm)
Other versions: affected |
ADP: redhat-SADP |
| Red Hat OpenShift Container Platform 4.20 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786496552; < * (unaffected, rpm)
Other versions: affected |
ADP: redhat-SADP |
| Red Hat OpenShift Container Platform 4.21 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786498169; < * (unaffected, rpm)
Other versions: affected |
ADP: redhat-SADP |
| Red Hat OpenShift Container Platform 4.22 Red Hat openshift4/ose-haproxy-router-rhel9
https://catalog.redhat.com/software/containers/ |
≥ 1786584196; < * (unaffected, rpm)
Other versions: affected |
ADP: redhat-SADP |
| Red Hat OpenShift Container Platform 4 Red Hat openshift4/ose-haproxy-router
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
ADP: redhat-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.7 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | CNA: redhat |
| 3.1 / 7.7 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | ADP: redhat-SADP |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/errata/RHSA-2026:54583CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54602CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54770CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:57408CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:65852CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:70587CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-42965CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2483184CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-42965ADP: redhat-SADP · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2483184ADP: redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42965.jsonADP: redhat-SADP · x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:57408ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54583ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54602ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:54770ADP: redhat-SADP · vendor-advisory, x_refsource_REDHAT
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