Description
mod_auth_openidc is an authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. In versions 2.0.0 through 2.4.13.1, when `OIDCStripCookies` is set and a crafted cookie supplied, a NULL pointer dereference would occur, resulting in a segmentation fault. This could be used in a Denial-of-Service attack and thus presents an availability risk. Version 2.4.13.2 contains a patch for this issue. As a workaround, avoid using `OIDCStripCookies`.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenIDC | mod_auth_openidc | >= 2.0.0, < 2.4.13.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache2-mod-auth-openidc | 2.4.12.3-2 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.4.12.3-2 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.4.12.3-2 | — |
| Debian 11 | libapache2-mod-auth-openidc | 2.4.9.4-0+deb11u3 | DSA-5405-1 |
| Debian 10 | libapache2-mod-auth-openidc | 2.3.10.2-1+deb10u2 | DLA-3409-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
| Ubuntu 20.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
| Ubuntu 18.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | mod_auth_openidc | 2.4.9.4-4.el9 | RHSA-2023:6365 |
| RHEL 8 | cjose +1 | 0.6.1-4.module+el8.9.0+19469+5b493da9 | RHSA-2023:6940 |
| RHEL 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+18723+672ccf5d | RHSA-2023:6940 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | mod_auth_openidc | 2.4.9.4-4.el9 | ALSA-2023:6365 |
| AlmaLinux 8 | cjose +1 | 0.6.1-4.module_el8.9.0+3631+0ced13d7 | ALSA-2023:6940 |
| AlmaLinux 8 | mod_auth_openidc | 2.4.9.4-5.module_el8.9.0+3631+0ced13d7 | ALSA-2023:6940 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | cjose | 0.6.1-4.module+el8.9.0+1384+4b58c166 | RLSA-2023:6940 |
| Rocky Linux 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+1384+4b58c166 | RLSA-2023:6940 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| SLES 15 SP6 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| SLES 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
Show 18 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLES 12 SP4 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLES for SAP 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES for SAP 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES for SAP 15 SP1 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLES for SAP 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLES for SAP 12 SP4 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLE Real Time 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLE HPC 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLE HPC 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SLE HPC 15 SP1 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SUSE OpenStack Cloud Crowbar 9 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SUSE OpenStack Cloud 9 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SUSE Manager Server 4.2 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SUSE Manager Proxy 4.2 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SUSE Enterprise Storage 7.1 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
| SUSE Enterprise Storage 7 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| openSUSE Leap 15.4 | apache2-mod_auth_openidc | 2.3.8-150100.3.25.1 | SUSE-SU-2023:1849-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | mod_auth_openidc | 2.4.14.2-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | mod_auth_openidc | 2.4.9.4-4.el9 | ELSA-2023-6365 |
| Oracle Linux 8 | cjose +1 | 0.6.1-4.module+el8.9.0+90009+6a7196cf | ELSA-2023-6940 |
| Oracle Linux 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+90009+6a7196cf | ELSA-2023-6940 |
Advisories 13
- WID-SEC-2023-2853 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- RLSA-2023:6940 Moderate: mod_auth_openidc:2.3 security and bug fix update Rocky Linux Security Advisories · Nov 5, 2026
- ALSA-2023:6940 Moderate: mod_auth_openidc:2.3 security and bug fix update AlmaLinux Security Advisories · Nov 5, 2026
- ALSA-2023:6365 Moderate: mod_auth_openidc security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- DSA-5405-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3409-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:4532-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1849-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:1837-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2023:6940 Red Hat Security Advisory: mod_auth_openidc:2.3 security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:6365 Red Hat Security Advisory: mod_auth_openidc security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2023-6940 Moderate: mod_auth_openidc:2.3 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 18, 2023
- ELSA-2023-6365 Moderate: mod_auth_openidc security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023
References
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-f5xw-rvfr-24qr
- https://github.com/OpenIDC/mod_auth_openidc/commit/c0e1edac3c4c19988ccdc7713d7aebfce6ff916a
- https://github.com/OpenIDC/mod_auth_openidc/blame/3f11976dab56af0a46a7dddb7a275cc16d6eb726/src/mod_auth_openidc.c#L178-L179
- https://github.com/OpenIDC/mod_auth_openidc/releases/tag/v2.4.13.2
- https://lists.debian.org/debian-lts-announce/2023/04/msg00034.html
- https://www.debian.org/security/2023/dsa-5405
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WIBKFC22PDH6UXMSZ23PHTD7736ZC7BB/