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High7.1Vendor: MediumRed Hat Linux

High [CVE-2026-42012] Certificate validation bypass due to improper handling of URI and SRV SANs

This high-severity Red Hat Linux advisory covers CVE-2026-42012 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

CVE-2026-42012 Published Apr 29, 2026
CVE-2026-42012
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Certificate validation bypass due to improper handling of URI and SRV SANs. Red Hat rates this moderate (CVSS 7.1).

Weakness: CWE-295. Affected package(s): rhui5/installer-rhel9:1781525693, libtasn1, gnutls, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791.

Resolved in Red Hat advisory RHSA-2026:20613 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; and 12 more.

Affected versions
  • rhui5/installer-rhel9:1781525693
  • libtasn1-0:4.13-3.el8_6.2
  • gnutls-0:3.6.16-7.el8_8.4
  • gnutls-0:3.8.10-4.el10_2
  • rhui5/cds-rhel9:1781525684
  • libtasn1-0:4.13-4.el8_8.1
  • discovery/discovery-ui-rhel9:1782166952
  • discovery/discovery-server-rhel9:1782159791
  • gnutls-0:3.8.3-6.el9_6.4
  • gnutls-0:3.6.16-8.el8_10.6
  • rhui5/rhua-rhel9:1781525739
  • rhui5/haproxy-rhel9:1781525671

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

Fixed versions
  • RHSA-2026:20613

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-2026:20613 (`sudo dnf update` / `yum update`).

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

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