CVE-2026-54789
published 2026-08-21CVE-2026-54789: 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…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.49%
41.1th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mod_auth_openidc_2.3 | mod_auth_openidc | — | — |
| openidc | mod_auth_openidc | < 2.4.19.4 | 2.4.19.4 |
| openidc | mod_auth_openidc | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.5HIGH
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Bugzilla
CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing [fedora-all]
bugzilla·2026-08-25·CVSS 7.5
CVE-2026-54789 [HIGH] CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing [fedora-all]
CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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
Bugzilla
CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing
bugzilla·2026-08-21·CVSS 7.5
CVE-2026-54789 [HIGH] CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing
CVE-2026-54789 mod_auth_openidc: mod_auth_openidc: Denial of Service via malformed state cookie parsing
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.
2026-08-21
Published