This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-54431 →

DEBIAN-CVE-2026-54431

In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC...

Original description

The description as published by the source.

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

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 liboauth2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 liboauth2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 liboauth2

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.0-1"}]}]

References

advisory security-tracker.debian.org