CVE-2026-85394
CVE-2026-85394 · python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret
Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.
python-jose through 3.5.0 fails to properly validate asymmetric keys in HMAC initialization, accepting DER-encoded public keys that lack PEM armor or SSH prefixes. Attackers holding the service's public key can forge HS256 tokens that pass verification when algorithms are not explicitly restricted. This is an incomplete fix for CVE-2024-33663.
CVSS 9.3 · Critique · EPSS 0,2%
- Publication
- Mise à jour
Pile logicielle: system
Produits et versions concernés
python-jose
- Versions du logiciel
- ≥ 0, ≤ 3.5.0: Concernée (semver)
Aucun correctif publié
python-jose Ubuntu:22.04:LTS
- Versions du logiciel
- 3.3.0+dfsg-1
- Plages de versions concernées
- ECOSYSTEM: (−∞, +∞)
Aucun correctif publié
python-jose Ubuntu:24.04:LTS
- Versions du logiciel
- 3.3.0+dfsg-4
- Plages de versions concernées
- ECOSYSTEM: (−∞, +∞)
Aucun correctif publié
Sources originales
- https://github.com/mpdavis/python-jose/issues/414
- https://github.com/mpdavis/python-jose
- https://github.com/mpdavis/python-jose/blob/018b310ddb8b50dcfd09a0c152117835a21dd656/jose/backends/native.py
- https://github.com/mpdavis/python-jose/blob/018b310ddb8b50dcfd09a0c152117835a21dd656/jose/utils.py
- https://github.com/advisories/GHSA-6c5p-j8vq-pqhj
- https://www.vulncheck.com/advisories/python-jose-through-3.5.0-algorithm-confusion-via-der-encoded-public-key-as-hmac-secret
- https://nvd.nist.gov/vuln/detail/CVE-2026-85394