Out-of-bounds Read Affecting mod_auth_openidc package, versions <0:2.4.16.11-1.el9_8.1


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.49% (41st percentile)

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  • Snyk IDSNYK-ROCKY9-MODAUTHOPENIDC-20722502
  • published10 Oct 2026
  • disclosed21 Aug 2026

Introduced: 21 Aug 2026

CVE-2026-54789  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:9 mod_auth_openidc to version 0:2.4.16.11-1.el9_8.1 or higher.
This issue was patched in RLSA-2026:79177.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mod_auth_openidc package and not the mod_auth_openidc package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1