CVE-2026-114615

Name	CVE-2026-114615
Description	Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.import_key() checks asymmetric-key markers only at byte zero while Authlib's PEM loaders accept leading whitespace, comments, or a byte-order mark. In deployments that use the documented mixed algorithm registry and already configure verification with PEM or certificate bytes containing such a prefix, an unauthenticated attacker who knows those same public-key bytes can use them as an HMAC secret and forge HS256 tokens with arbitrary identity or authorization claims. This is a bypass of the remediation for CVE-2024-37568. The module-level jwt object reaches OctKey.import_key() in authlib/jose/rfc7518/oct_key.py, where POSSIBLE_UNSAFE_KEYS fails to identify prefixed asymmetric key material. This issue is fixed in version 1.9.0.
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
python-authlib (PTS)	bookworm	1.2.0-1+deb12u1	vulnerable
	bookworm (security)	1.2.0-1+deb12u2	vulnerable
	trixie	1.6.0-1+deb13u1	vulnerable
	forky, sid	1.7.2-2	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-authlib	source	(unstable)	(unfixed)

Notes

https://github.com/authlib/authlib/security/advisories/GHSA-7vr2-2fgp-9w7p
https://github.com/authlib/authlib/pull/945
Fixed by: https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf (v1.9.0)