CVE catalog

CVE-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 functionality. Prior to 2.4.19.4, an out

[CVE catalog]

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.49% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianlibapache2-mod-auth-openidcsid2.4.20.3-1fixed
Debianlibapache2-mod-auth-openidcforky2.4.20.3-1fixed
Debianlibapache2-mod-auth-openidctrixie2.4.17-1vulnerable
Debianlibapache2-mod-auth-openidctrixie-security2.4.17-1+deb13u1fixed
Debianlibapache2-mod-auth-openidcbookworm2.4.12.3-2+deb12u4vulnerable
Debianlibapache2-mod-auth-openidcbookworm-security2.4.12.3-2+deb12u5fixed
Suseapache2-mod_auth_openidclinux enterprise server 16.02.4.17.1-160000.2.1fixed
Suseapache2-mod_auth_openidclinux enterprise server for sap applications 16.02.4.17.1-160000.2.1fixed
Suseapache2-mod_auth_openidclinux enterprise module for server applications 15 sp72.4.17.1-150600.16.20.1fixed
Suseapache2-mod_auth_openidclinux enterprise server 15 sp6-ltss2.4.17.1-150600.16.20.1fixed
Suseapache2-mod_auth_openidclinux enterprise server for sap applications 15 sp62.4.17.1-150600.16.20.1fixed
Suseapache2-mod_auth_openidclinux enterprise high performance computing 15 sp4-espos2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise high performance computing 15 sp4-ltss2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise high performance computing 15 sp5-espos2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise high performance computing 15 sp5-ltss2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise server 15 sp4-ltss2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise server 15 sp5-ltss2.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise server for sap applications 15 sp42.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise server for sap applications 15 sp52.4.17.1-150100.3.40.1fixed
Suseapache2-mod_auth_openidclinux enterprise server 12 sp5-ltss2.4.0-7.25.1fixed
Suseapache2-mod_auth_openidclinux enterprise server ltss extended security 12 sp52.4.0-7.25.1fixed
Ubuntulibapache2-mod-auth-openidc16.041.6.0-1vulnerable
Ubuntulibapache2-mod-auth-openidc16.041.8.5-1vulnerable
Ubuntulibapache2-mod-auth-openidc18.042.1.6-1vulnerable
Ubuntulibapache2-mod-auth-openidc18.042.3.1-2vulnerable
Ubuntulibapache2-mod-auth-openidc18.042.3.2-1vulnerable
Ubuntulibapache2-mod-auth-openidc18.042.3.2-1build1vulnerable
Ubuntulibapache2-mod-auth-openidc18.042.3.3-1build1vulnerable
Ubuntulibapache2-mod-auth-openidc20.042.3.10.2-1vulnerable
Ubuntulibapache2-mod-auth-openidc20.042.4.0.4-1vulnerable
Ubuntulibapache2-mod-auth-openidc20.042.4.1-1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.9-1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.9.4-1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.10-1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.10-1build1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.11-1vulnerable
Ubuntulibapache2-mod-auth-openidc22.042.4.11-1ubuntu0.1vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.14.2-1vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.14.4-2vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.14.4-2build1vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.15.1-1vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.15.1-1build2vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.15.1-1build3vulnerable
Ubuntulibapache2-mod-auth-openidc24.042.4.15.1-1ubuntu0.1vulnerable
Ubuntulibapache2-mod-auth-openidc26.042.4.17-1vulnerable
Ubuntulibapache2-mod-auth-openidc26.042.4.18.1-1vulnerable
Opensuseapache2-mod_auth_openidcleap 16.02.4.17.1-160000.2.1fixed
Opensuseapache2-mod_auth_openidctumbleweed2.4.20.2-1.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianlibapache2-mod-auth-openidcsourcesid2.4.19.4-1not yet assignedNot reportedNot reported
Debianlibapache2-mod-auth-openidcsourceforky2.4.19.4-1not yet assignedNot reportedNot reported
Debianlibapache2-mod-auth-openidcsourcetrixie2.4.17-1+deb13u1not yet assignedNot reportedNot reported
Debianlibapache2-mod-auth-openidcsourcebookworm2.4.12.3-2+deb12u5not yet assignedNot reportedNot reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server 16.02.4.17.1-160000.2.1Not reportedSUSE-SU-2026:23593-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server for sap applications 16.02.4.17.1-160000.2.1Not reportedSUSE-SU-2026:23593-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise module for server applications 15 sp72.4.17.1-150600.16.20.1Not reportedSUSE-SU-2026:3952-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server 15 sp6-ltss2.4.17.1-150600.16.20.1Not reportedSUSE-SU-2026:3952-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server for sap applications 15 sp62.4.17.1-150600.16.20.1Not reportedSUSE-SU-2026:3952-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise high performance computing 15 sp4-espos2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise high performance computing 15 sp4-ltss2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise high performance computing 15 sp5-espos2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise high performance computing 15 sp5-ltss2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server 15 sp4-ltss2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server 15 sp5-ltss2.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server for sap applications 15 sp42.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server for sap applications 15 sp52.4.17.1-150100.3.40.1Not reportedSUSE-SU-2026:3953-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server 12 sp5-ltss2.4.0-7.25.1Not reportedSUSE-SU-2026:3915-1Not reported
Suseapache2-mod_auth_openidcrpmlinux enterprise server ltss extended security 12 sp52.4.0-7.25.1Not reportedSUSE-SU-2026:3915-1Not reported
Opensuseapache2-mod_auth_openidcrpmleap 16.02.4.17.1-160000.2.1Not reportedOPENSUSE-SU-2026:21717-1Not reported
Opensuseapache2-mod_auth_openidcrpmtumbleweed2.4.20.2-1.1Not reportedOPENSUSE-SU-2026:11582-1Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libapache2-mod-auth-openidc]Affected
    Details (4)

    • 2.4.12.3-2+deb12u4 · amd64 · bookworm

      Affected · Fixed: 2.4.12.3-2+deb12u5

      nvd · libapache2-mod-auth-openidc · debian · bookworm

    • 2.4.12.3-2+deb12u4 · arm64 · bookworm

      Affected · Fixed: 2.4.12.3-2+deb12u5

      nvd · libapache2-mod-auth-openidc · debian · bookworm

    • 2.4.12.3-2+deb12u4 · amd64 · bookworm-security

      Affected · Fixed: 2.4.12.3-2+deb12u5

      nvd · libapache2-mod-auth-openidc · debian · bookworm

    • 2.4.12.3-2+deb12u4 · arm64 · bookworm-security

      Affected · Fixed: 2.4.12.3-2+deb12u5

      nvd · libapache2-mod-auth-openidc · debian · bookworm

[openSUSE Tumbleweed]

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]