This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-102266 →

DEBIAN-CVE-2026-102266

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification...

Original description

The description as published by the source.

PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a trusted JWK Set contains an oct entry with an empty k value. As a result, an attacker signs an HMAC token with the same zero-length key accepted by PyJWT. Consequently, forged token can carry arbitrary authenticated claims. This issue is fixed in version 2.14.0.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:13 pyjwt

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

Debian:14 pyjwt

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.14.0-1"}]}]

References

advisory security-tracker.debian.org