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TI-2026-39304 Aliases CVE-2026-54431GHSA-3pf6-g4x4-jm46

Improper Data Validation in liboauth2

Priority LOW 22CWE-358Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header. This issue was fixed in version 2.3.0

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00178 7th percentileScored 2026-11-07
Fix Fixed liboauth2 (OpenIDC): 2.3.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenIDCliboauth2before 2.3.02.3.0Patch availableCNA
  • liboauth2 VendorOpenIDC Affected before 2.3.0 Fixed in 2.3.0 Patch available CNA

Remediation

  • Fix · CNA liboauth2 (OpenIDC) Fixed in 2.3.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    OpenIDC liboauth2 2.3.0

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-39303 Server-Site Request Forgery in liboauth2Priority LOW 22
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54431
  2. 2026-10-03 Alias added: GHSA-3pf6-g4x4-jm46

References

Advisory 1

Other 2

  • TI-2026-38908 OpenIDC/cjose uses all-zero Content Encryption Key for AES-CBC-HMAC JWE encryption CVSS 3.1CRITICAL 9.1
  • TI-2024-16331 Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc CVSS 3.1HIGH 7.5
  • TI-2023-19073 Incorrect Authentication Tag length usage in AES GCM decryption in OpenIDC/cjose CVSS 3.1HIGH 8.6
  • TI-2017-04220 The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc)… CVSS 3.0HIGH 8.6
  • TI-2017-03971 The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc)… CVSS 3.0HIGH 8.6
  • TI-2025-22673 mod_auth_openidc allows OIDCProviderAuthRequestMethod POSTs to leak protected data CVSS 4.0HIGH 8.2
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences