CVE-2026-102272

Name	CVE-2026-102272
Description	PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.prepare_key in jwt/algorithms.py is affected because raw-JWK detector does not normalize accepted Unicode byte-order marks before checking for JSON. This occurs when a public JWK is prefixed with a UTF-8 BOM and used in a mixed-algorithm verification path. As a result, public JWK bypasses asymmetric-key detection and becomes the HMAC secret. Consequently, an attacker who knows the public key can forge authenticated tokens. This issue is fixed in version 2.14.0.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
pyjwt (PTS)	bookworm, bookworm (security)	2.6.0-1+deb12u1	vulnerable
	trixie (security), trixie	2.10.1-2+deb13u1	vulnerable
	forky	2.13.0-1	vulnerable
	sid	2.15.1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pyjwt	source	(unstable)	2.14.0-1

Notes

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-r6x4-923q-g947
Fixed by: https://github.com/jpadilla/pyjwt/commit/180783930de91876bc0d601f826a1f2956057291 (2.14.0)