VULNERABILITY INTELLIGENCE
CVE-2026-54431
EPSS probability0.18%
CISA KEVNot currently listed
Published2026-07-02
Last modified2026-10-25
Description
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
Weakness classification
- cvd@cert.pl: CWE-358