CVE-2026-85394
CVE-2026-85394 · python-jose through 3.5.0 Algorithm Confusion via DER-encoded Public Key as HMAC Secret
Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.
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 · Crítica · EPSS 0,2%
- Publicación
- Actualización
Pila tecnológica: system
Productos y versiones afectados
python-jose
- Versiones
- ≥ 0, ≤ 3.5.0: Afectada (semver)
Sin corrección publicada
python-jose Ubuntu:22.04:LTS
- Versiones
- 3.3.0+dfsg-1
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
python-jose Ubuntu:24.04:LTS
- Versiones
- 3.3.0+dfsg-4
- Intervalos de versiones afectados
- ECOSYSTEM: (−∞, +∞)
Sin corrección publicada
Fuentes 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