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Vulnerabilities

Vulnerability · 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.

Published Aug 21, 2026 · catalog updated Oct 15, 2026 · mod_auth_openidc is an OpenID

Check if you run it

No confirmed exploitation is on record for CVE-2026-54789. EPSS is 0.49%. Act only if a listed version of mod_auth_openidc is an OpenID is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (mod_auth_openidc is an OpenID).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.49%
Remediation
Advisory link
Affected products
See sources for product scope

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 . 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 headers (tokens lacking ) can reduce exposure, but upgrading is the recommended remediation.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-54789

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-54789. EPSS is 0.49%. Act only if a listed version of mod_auth_openidc is an OpenID is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read; CWE-787: Out-of-bounds Write. EPSS 0.49%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 21, 2026 · NIST NVD

    Detected

    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 . The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is r

  2. Oct 15, 2026 · NIST NVD

    Updated

    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 . The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is r

Sources

  • CVE.orgVulnerability recordCVE-2026-54789

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-54789

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-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-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie par

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.