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Advisory severityHigh7.4Red Hat Linux

High [CVE-2026-46579] mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend

This high-severity Red Hat Linux advisory covers CVE-2026-46579 affecting Red Hat OpenShift Container Platform 4.20, Red Hat OpenShift Container Platform 4.21, Red Hat OpenShift Container Platform 4.22.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-46579 Source published

VulniPulse record published

CVE-2026-46579
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

mTLS client certificate spoofing via unstripped X-SSL-Client headers on HTTP frontend. Red Hat rates this important (CVSS 7.4).

Weakness: CWE-287. Affected package(s): openshift4/ose-haproxy-router-rhel9:1781552170, openshift4/ose-haproxy-router-rhel9:1781643967, openshift4/ose-haproxy-router-rhel9:1781639027.

Resolved in Red Hat advisory RHSA-2026:27063 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat OpenShift Container Platform 4.20; Red Hat OpenShift Container Platform 4.21; Red Hat OpenShift Container Platform 4.22; Red Hat OpenShift Container Platform 4.19; and 7 more.

Affected versions
  • openshift4/ose-haproxy-router-rhel9:1781552170
  • openshift4/ose-haproxy-router-rhel9:1781643967
  • openshift4/ose-haproxy-router-rhel9:1781639027

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:27063

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:27063 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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