CVE-2026-54431

unknowncovered by 1 sourcefirst seen 2026-07-02

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

⚡ Watch CVE-2026-54431

Get an email if CVE-2026-54431 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.

Exploitation outlook

Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Advisory coverage (1)

unknownCVE-2026-54431: In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON …nvd · 2026-07-02

External references

NVD record for CVE-2026-54431

CVE.org record

Embed the live status

— this badge updates automatically when the KEV or exploit status changes. How to embed it →

[![CVE-2026-54431 status](https://www.csirts.com/badge/CVE-2026-54431)](https://www.csirts.com/cve/CVE-2026-54431)