CVE-2026-48526

Name	CVE-2026-48526
Description	PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.
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)
Debian Bugs	1138191

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
pyjwt (PTS)	bullseye	1.7.1-2	vulnerable
	bullseye (security)	1.7.1-2+deb11u1	vulnerable
	bookworm, bookworm (security)	2.6.0-1+deb12u1	vulnerable
	trixie (security), trixie	2.10.1-2+deb13u1	vulnerable
	forky, sid	2.12.1-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
pyjwt	source	(unstable)	(unfixed)			1138191

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-xgmm-8j9v-c9wx