RHSA-2026:69718HighCVSS 7.5

Red Hat Security Advisory: mod_auth_openidc security update

Published
September 22, 2026
Last Modified
September 22, 2026

🔗 CVE IDs covered (1)

CVE-2026-54789 →

📋 Description

CVE-2026-54789 — mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing

🎯 Affected products14

  • Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-0:2.4.9.4-4.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-0:2.4.9.4-4.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-0:2.4.9.4-4.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-0:2.4.9.4-4.el9_4.3.src as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-0:2.4.9.4-4.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-4.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-4.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-4.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-4.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debugsource-0:2.4.9.4-4.el9_4.3.aarch64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debugsource-0:2.4.9.4-4.el9_4.3.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debugsource-0:2.4.9.4-4.el9_4.3.s390x as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)
  • mod_auth_openidc-debugsource-0:2.4.9.4-4.el9_4.3.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.9.4)

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Inspect incoming HTTP requests using a Web Application Firewall (WAF), reverse proxy, or Apache’s mod_rewrite module prior to evaluation by mod_auth_openidc. Configure security rules to reject or drop any requests containing malformed Cookie headers—specifically OpenID Connect state cookie tokens that lack an equals sign (=).

🔗 References (4)