# CVE-2026-54789: libapache2-mod-auth-openidc: mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that i... CVE-2026-54789 is fixed in 7 products on 1 platform, first by RHSA-2026:69719, released August 21, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-54789 - Priority: High - CVSS: 8.2 (high) - EPSS: 0.0049 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 21, 2026 ## Description mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading is the recommended remediation. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | apache2-mod_auth_openidc opensuse-leap 16.0 | 2.4.17.1-160000.2.1 | [OPENSUSE-SU-2026:21717-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21717-1.md) | Sep 1, 2026 | | Linux | apache2-mod_auth_openidc sles 15.6 | 2.4.17.1-150600.16.20.1 | [SUSE-SU-2026:3952-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3952-1.md) | Sep 3, 2026 | | Linux | apache2-mod_auth_openidc sles 15.7 | 2.4.17.1-150600.16.20.1 | [SUSE-SU-2026:3952-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-3952-1.md) | Sep 3, 2026 | | Linux | apache2-mod_auth_openidc sles 16.0 | 2.4.17.1-160000.2.1 | [SUSE-SU-2026:23593-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23593-1.md) | Sep 1, 2026 | | Linux | cjose RHEL 8 | 0:0.6.1-5.module+el8.10.0+24880+4db9166e | [RHSA-2026:77369](https://patchblox.com/security/data/fix/linux/rhsa-2026-77369.md) | Oct 8, 2026 | | Linux | cjose almalinux 8 | 0.6.1-5.module_el8.10.0+4297+63ae3533 | [ALSA-2026:77369](https://patchblox.com/security/data/fix/linux/alsa-2026-77369.md) | Oct 7, 2026 | | Linux | cjose ol 8 | 0:0.6.1-5.module+el8.10.0+91060+e975931f | [ELSA-2026-77369](https://patchblox.com/security/data/fix/linux/elsa-2026-77369.md) | Nov 7, 2026 | | Linux | cjose rocky 8 | 0:0.6.1-5.module+el8.10.0+40373+8a3f15d2 | [RLSA-2026:77369](https://patchblox.com/security/data/fix/linux/rlsa-2026-77369.md) | Nov 7, 2026 | | Linux | cjose-devel RHEL 8 | 0:0.6.1-5.module+el8.10.0+24880+4db9166e | [RHSA-2026:77369](https://patchblox.com/security/data/fix/linux/rhsa-2026-77369.md) | Oct 8, 2026 | | Linux | cjose-devel almalinux 8 | 0.6.1-5.module_el8.10.0+4297+63ae3533 | [ALSA-2026:77369](https://patchblox.com/security/data/fix/linux/alsa-2026-77369.md) | Oct 7, 2026 | | Linux | cjose-devel ol 8 | 0:0.6.1-5.module+el8.10.0+91060+e975931f | [ELSA-2026-77369](https://patchblox.com/security/data/fix/linux/elsa-2026-77369.md) | Nov 7, 2026 | | Linux | libapache2-mod-auth-openidc Debian 12.15 (bookworm) | 2.4.12.3-2+deb12u5 | [DEBIAN-CVE-2026-54789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54789.md) | Aug 21, 2026 | | Linux | libapache2-mod-auth-openidc Debian 13.5 (trixie) | 2.4.17-1+deb13u1 | [DEBIAN-CVE-2026-54789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54789.md) | Aug 21, 2026 | | Linux | libapache2-mod-auth-openidc Debian 14 | 2.4.19.4-1 | [DEBIAN-CVE-2026-54789](https://patchblox.com/security/data/fix/linux/debian-cve-2026-54789.md) | Aug 21, 2026 | | Linux | mod_auth_openidc RHEL 10 | 2.4.15-4.el10_0.2 | [RHSA-2026:69719](https://patchblox.com/security/data/fix/linux/rhsa-2026-69719.md) | Aug 21, 2026 | | Linux | mod_auth_openidc RHEL 8 | 0:2.4.9.4-9.module+el8.10.0+24880+4db9166e | [RHSA-2026:77369](https://patchblox.com/security/data/fix/linux/rhsa-2026-77369.md) | Oct 8, 2026 | | Linux | mod_auth_openidc RHEL 9 | 0:2.4.16.11-1.el9_8.1 | [RHSA-2026:79177](https://patchblox.com/security/data/fix/linux/rhsa-2026-79177.md) | Oct 9, 2026 | | Linux | mod_auth_openidc almalinux 10 | 2.4.16.11-1.el10_2.1 | [ALSA-2026:75581](https://patchblox.com/security/data/fix/linux/alsa-2026-75581.md) | Oct 5, 2026 | | Linux | mod_auth_openidc almalinux 8 | 2.4.9.4-9.module_el8.10.0+4297+63ae3533 | [ALSA-2026:77369](https://patchblox.com/security/data/fix/linux/alsa-2026-77369.md) | Oct 7, 2026 | | Linux | mod_auth_openidc almalinux 9 | 2.4.16.11-1.el9_8.1 | [ALSA-2026:79177](https://patchblox.com/security/data/fix/linux/alsa-2026-79177.md) | Oct 8, 2026 | | Linux | mod_auth_openidc amzn 2023 | 2.4.16.11-1.amzn2023.0.2 | [ALAS2023-2026-2155](https://patchblox.com/security/data/fix/linux/alas2023-2026-2155.md) | Sep 14, 2026 | | Linux | mod_auth_openidc ol 10 | 0:2.4.16.11-1.el10_2.1 | [ELSA-2026-75581](https://patchblox.com/security/data/fix/linux/elsa-2026-75581.md) | Oct 5, 2026 | | Linux | mod_auth_openidc ol 8 | 0:2.4.9.4-9.module+el8.10.0+91060+e975931f | [ELSA-2026-77369](https://patchblox.com/security/data/fix/linux/elsa-2026-77369.md) | Nov 7, 2026 | | Linux | mod_auth_openidc ol 9 | 0:2.4.16.11-1.el9_8.1 | [ELSA-2026-79177](https://patchblox.com/security/data/fix/linux/elsa-2026-79177.md) | Nov 7, 2026 | | Linux | mod_auth_openidc rocky 10 | 0:2.4.16.11-1.el10_2.1 | [RLSA-2026:75581](https://patchblox.com/security/data/fix/linux/rlsa-2026-75581.md) | Oct 6, 2026 | | Linux | mod_auth_openidc rocky 8 | 0:2.4.9.4-9.module+el8.10.0+40373+8a3f15d2 | [RLSA-2026:77369](https://patchblox.com/security/data/fix/linux/rlsa-2026-77369.md) | Nov 7, 2026 | | Linux | mod_auth_openidc rocky 9 | 0:2.4.16.11-1.el9_8.1 | [RLSA-2026:79177](https://patchblox.com/security/data/fix/linux/rlsa-2026-79177.md) | Nov 7, 2026 | | Linux | mod_auth_openidc-debuginfo amzn 2023 | 2.4.16.11-1.amzn2023.0.2 | [ALAS2023-2026-2155](https://patchblox.com/security/data/fix/linux/alas2023-2026-2155.md) | Sep 14, 2026 | | Linux | mod_auth_openidc-debugsource amzn 2023 | 2.4.16.11-1.amzn2023.0.2 | [ALAS2023-2026-2155](https://patchblox.com/security/data/fix/linux/alas2023-2026-2155.md) | Sep 14, 2026 | --- Data as of 2026-11-09T07:25:28Z UTC. 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