# CVE-2026-1757: Libxml2: memory leak leading to local denial of service in xmllint interactive shell

Status: published. Published: 2026-02-02. Updated: 2026-11-06.

A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.

## 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)

## Affected products and versions

- Red Hat / Red Hat Hardened Images (libxml2-main): ≥ 2.15.2-0.3.hum1; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 10 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat JBoss Core Services (libxml2): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ai-gateway-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-core-bff-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-dashboard-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-dashboard-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-data-science-pipelines-operator-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kf-notebook-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-llmisvc-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kserve-module-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kuberay-operator-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-kube-rbac-proxy-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-llama-stack-k8s-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-maas-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mlflow-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mlflow-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-agent-ops-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-automl-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-autorag-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-eval-hub-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-gen-ai-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-maas-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-mlflow-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-mod-arch-model-registry-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-registry-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-model-serving-api-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-notebook-controller-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ogx-k8s-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-ogx-module-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-training-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-trustyai-service-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift AI (RHOAI) (rhoai/odh-workbenches-operator-rhel9): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-9): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 6.2 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.22% as of 2026-11-05; percentile 12.30%

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

- Weaknesses: CWE-401

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:7519 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-1757 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2435940 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009 (CNA: redhat)

- https://access.redhat.com/errata/RHSA-2026:7519 (secalert@redhat.com)

- https://access.redhat.com/security/cve/CVE-2026-1757 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2435940 (secalert@redhat.com)

- https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-1757; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1757; retrieved 2026-11-06; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-1757; retrieved 2026-11-05; source updated Not reported

Revision: f6b2037548c381d9cbe5836537c763251681d809b45307215abca995ec19e5d1

Canonical: https://y2.dev/cve/CVE-2026-1757

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