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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade cjoseUpgrade mod_auth_openidcUpgrade cjose-devel | Oct 11, 2026 | Oct 8, 2026 |
| Amazon_linux_2023 | — | Upgrade mod_auth_openidc-debugsourceUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidc | Sep 30, 2026 | Aug 21, 2026 |
| Debian | — | Upgrade libapache2-mod-auth-openidc | Sep 21, 2026 | Aug 21, 2026 |
| Redhat_linux | — | Upgrade cjose-debugsourceUpgrade cjose-develUpgrade cjoseUpgrade cjose-debuginfoUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidcUpgrade mod_auth_openidc-debugsource | Aug 26, 2026 | Aug 21, 2026 |
| Rocky_linux | — | Upgrade cjose-develUpgrade cjoseUpgrade cjose-debuginfoUpgrade cjose-debugsourceUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidcUpgrade mod_auth_openidc-debugsource | Oct 8, 2026 | Oct 6, 2026 |
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