Amazon Linux 2023 Security Advisory: ALAS2023-2026-2155
Advisory Released Date: 2026-09-14
Advisory Updated Date: 2026-09-14
Severity:
Important
Issue Overview:
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. (CVE-2026-54789)
Affected Packages:
mod_auth_openidc
Issue Correction:
Run dnf update mod_auth_openidc --releasever 2023.12.20260914 or dnf update --advisory ALAS2023-2026-2155 --releasever 2023.12.20260914 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
aarch64:
mod_auth_openidc-debuginfo-2.4.16.11-1.amzn2023.0.2.aarch64
mod_auth_openidc-debugsource-2.4.16.11-1.amzn2023.0.2.aarch64
mod_auth_openidc-2.4.16.11-1.amzn2023.0.2.aarch64
src:
mod_auth_openidc-2.4.16.11-1.amzn2023.0.2.src
x86_64:
mod_auth_openidc-2.4.16.11-1.amzn2023.0.2.x86_64
mod_auth_openidc-debuginfo-2.4.16.11-1.amzn2023.0.2.x86_64
mod_auth_openidc-debugsource-2.4.16.11-1.amzn2023.0.2.x86_64