Out-of-bounds read in mod_auth_openidc - CVE-2026-54789

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Main Vulnerability Database Vulnerabilities #VU136688

Out-of-bounds read in mod_auth_openidc - CVE-2026-54789

Published: July 2, 2026


Vulnerability identifier: #VU136688
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54789
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in the state-cookie parser of mod_auth_openidc. A remote attacker can trigger an out-of-bounds read error and cause a denial of service condition on the system.


Affected software

mod_auth_openidc
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Server Applications Module
openSUSE Leap
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
openidc (Red Hat package)
apache2-mod_auth_openidc-debugsource
apache2-mod_auth_openidc
apache2-mod_auth_openidc-debuginfo
libapache2-mod-auth-openidc (Debian package)
mod_auth_openidc
mod_auth_openidc-debuginfo
mod_auth_openidc-debugsource

How to mitigate CVE-2026-54789

Install updates from vendor's website.

mod_auth_openidc - update to 2.4.19.4
openidc (Red Hat package) - addressed in versions 1.8.8-9.el7_9.2, 2.4.9.4-1.el9_2.4, 2.4.9.4-4.el9_4.3, 2.4.10-1.el9_6.3, 2.4.15-4.el10_0.2, 2.4.16.11-1.el9_8.1, 2.4.16.11-1.el10_2.1
apache2-mod_auth_openidc-debugsource - addressed in versions 2.4.0-7.25.1, 2.4.17.1-150100.3.40.1, 2.4.17.1-150600.16.20.1
apache2-mod_auth_openidc - addressed in versions 2.4.0-7.25.1, 2.4.17.1-150100.3.40.1, 2.4.17.1-150600.16.20.1
apache2-mod_auth_openidc-debuginfo - addressed in versions 2.4.0-7.25.1, 2.4.17.1-150100.3.40.1, 2.4.17.1-150600.16.20.1
libapache2-mod-auth-openidc (Debian package) - update to 2.4.17-1+deb13u1
mod_auth_openidc - update to 2.4.19.4-1
mod_auth_openidc-debuginfo - update to 2.4.19.4-1
mod_auth_openidc-debugsource - update to 2.4.19.4-1

External References

Related Security Bulletins