RHSA-2026:77369HighCVSS 8.2

Red Hat Security Advisory: mod_auth_openidc:2.3 security update

Published
October 7, 2026
Last Modified
October 14, 2026

🔗 CVE IDs covered (2)

CVE-2026-53938 →CVE-2026-54789 →

📋 Description

CVE-2026-53938 — cjose: cjose: Heap buffer overflow in AES Key Wrap decryption leads to denial of service CVE-2026-54789 — mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing

🎯 Affected products31

  • Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-0:0.6.1-5.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-0:0.6.1-5.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-0:0.6.1-5.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-0:0.6.1-5.module+el8.10.0+24880+4db9166e.src (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-0:0.6.1-5.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debuginfo-0:0.6.1-5.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debuginfo-0:0.6.1-5.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debuginfo-0:0.6.1-5.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debuginfo-0:0.6.1-5.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debugsource-0:0.6.1-5.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debugsource-0:0.6.1-5.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debugsource-0:0.6.1-5.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-debugsource-0:0.6.1-5.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-devel-0:0.6.1-5.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-devel-0:0.6.1-5.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-devel-0:0.6.1-5.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • cjose-devel-0:0.6.1-5.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.src (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debuginfo-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.x86_64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debugsource-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.aarch64 (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debugsource-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.ppc64le (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_auth_openidc-debugsource-0:2.4.9.4-9.module+el8.10.0+24880+4db9166e.s390x (mod_auth_openidc:2.3) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +1 more not shown

✅ 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: Applications using `cjose` should be configured to reject JWEs that specify the AES Key Wrap key-management algorithms (`A128KW`, `A192KW`, `A256KW`) when processing untrusted input. This application-layer rejection prevents the vulnerable decryption path from being exercised. 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 (5)