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. In affected versions missing input validation on mod_auth_openidc_session_chunks cookie value makes the server vulnerable to a denial of service (DoS) attack. An internal security audit has been conducted and the reviewers found that if they manipulated the value of the mod_auth_openidc_session_chunks cookie to a very large integer, like 99999999, the server struggles with the request for a long time and finally gets back with a 500 error. Making a few requests of this kind caused our server to become unresponsive. Attackers can craft requests that would make the server work very hard (and possibly become unresponsive) and/or crash with minimal effort. This issue has been addressed in version 2.4.15.2. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenIDC | mod_auth_openidc | >= 2.0.0, < 2.4.15.2 | — |
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 | 2.4.15.7-1 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.4.15.7-1 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.4.12.3-2+deb12u1 | — |
| Debian 10 | libapache2-mod-auth-openidc | 2.3.10.2-1+deb10u4 | DLA-3751-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
| 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 | 2.4.10-1.el9 | RHSA-2024:9180 |
| RHEL 8 | cjose +1 | 0.6.1-4.module+el8.10.0+21813+b5444eb8 | RHSA-2024:5289 |
| RHEL 8 | mod_auth_openidc | 2.4.9.4-6.module+el8.10.0+21813+b5444eb8 | RHSA-2024:5289 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | mod_auth_openidc | 2.4.10-1.el9 | ALSA-2024:9180 |
| AlmaLinux 8 | cjose +1 | 0.6.1-4.module_el8.9.0+3631+0ced13d7 | ALSA-2024:5289 |
| AlmaLinux 8 | mod_auth_openidc | 2.4.9.4-6.module_el8.10.0+3881+234adf82 | ALSA-2024:5289 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | mod_auth_openidc | 2.4.10-1.el9 | RLSA-2024:9180 |
| Rocky Linux 8 | cjose | 0.6.1-4.module+el8.9.0+1384+4b58c166 | RLSA-2024:5289 |
| Rocky Linux 8 | mod_auth_openidc | 2.4.9.4-6.module+el8.10.0+1846+b7dcd2c3 | RLSA-2024:5289 |
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 | 2.3.8-150600.16.5.1 | SUSE-SU-2025:4532-1, SUSE-SU-2024:2299-1 |
| SLES 15 SP5 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.12.2 | SUSE-SU-2024:0758-1 |
| SLES for SAP 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES for SAP 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES for SAP 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLES for SAP 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.12.2 | SUSE-SU-2024:0758-1 |
| SLE HPC 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLE HPC 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SLE HPC 15 SP2 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SUSE Manager Server 4.3 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SUSE Manager Proxy 4.3 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
| SUSE Enterprise Storage 7.1 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2-mod_auth_openidc | 2.4.15.3-1.1 | openSUSE-SU-2024:13699-1 |
| openSUSE Leap 15.6 | apache2-mod_auth_openidc | 2.3.8-150600.16.5.1 | SUSE-SU-2025:4532-1, SUSE-SU-2024:2299-1 |
| openSUSE Leap 15.5 | apache2-mod_auth_openidc | 2.3.8-150100.3.28.1 | SUSE-SU-2024:0757-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | mod_auth_openidc | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | mod_auth_openidc | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | mod_auth_openidc | 2.4.10-1.el9 | ELSA-2024-9180 |
| Oracle Linux 8 | cjose +1 | 0.6.1-4.module+el8.10.0+90385+c8f58f84 | ELSA-2024-5289 |
| Oracle Linux 8 | mod_auth_openidc | 2.4.9.4-6.module+el8.10.0+90385+c8f58f84 | ELSA-2024-5289 |
Advisories 15
- ALSA-2024:9180 Moderate: mod_auth_openidc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:5289 Moderate: mod_auth_openidc:2.3 security update AlmaLinux Security Advisories · Oct 29, 2026
- WID-SEC-2024-1850 Red Hat Enterprise Linux: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Oct 11, 2026
- RHSA-2024:5289 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Aug 12, 2026
- RHSA-2024:9180 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DLA-3751-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:9180 Moderate: mod_auth_openidc security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2024:2299-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13699-1 apache2-mod_auth_openidc-2.4.15.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0757-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4532-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:0758-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2024:5289 Moderate: mod_auth_openidc:2.3 security update Rocky Linux Security Advisories · May 7, 2025
- ELSA-2024-9180 Moderate: mod_auth_openidc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
- ELSA-2024-5289 Moderate: mod_auth_openidc:2.3 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 14, 2024
References
- https://github.com/OpenIDC/mod_auth_openidc/security/advisories/GHSA-hxr6-w4gc-7vvv
- https://github.com/OpenIDC/mod_auth_openidc/commit/4022c12f314bd89d127d1be008b1a80a08e1203d
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T7DKVEVREYAI4F46CQAVOTPL75WLOZOE/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00004.html