CVE-2026-54789
highpriority · track · 0EPSS 0.005 · 42 %ileDEEPSS · scored 2026-10-27
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
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (14)
Products and version ranges known to be affected.
- Red Hat Enterprise Linux 10.0 Extended Update Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:10.0_extended_update_support
- Red Hat Enterprise Linux 7 Extended Lifecycle Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:7_extended_lifecycle_support
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.4_advanced_mission_critical_update_support
- Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.4_extended_update_support_long-life_add-on
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.6_advanced_mission_critical_update_support
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.6_extended_update_support_long-life_add-on
- Red Hat Enterprise Linux 8.8 Telecommunications Update Serviceall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.8_telecommunications_update_service
- Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionsall versionscert_bundDEcpe:/o:redhat:enterprise_linux:8.8_update_services_for_sap_solutions
- Red Hat Enterprise Linux 9.2 Update Services for SAP Solutionsall versionscert_bundDEcpe:/o:redhat:enterprise_linux:9.2_update_services_for_sap_solutions
- Red Hat Enterprise Linux 9.4 Update Services for SAP Solutionsall versionscert_bundDEcpe:/o:redhat:enterprise_linux:9.4_update_services_for_sap_solutions
- Red Hat Enterprise Linux 9.6 Extended Update Supportall versionscert_bundDEcpe:/o:redhat:enterprise_linux:9.6_extended_update_support
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-3492Red Hat Enterprise Linux (mod_auth_openidc): Schwachstelle ermöglicht Denial of ServiceDeutsch2026-09-21csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Red Hat Enterprise Linux ausnutzen, um einen Denial of Service Angriff durchzuführen.
sources
Which sources assert this record, and when.
references (3) nvd
External citations — patches, advisories, analysis.
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