Is CVE-2026-85394 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-85394?

CVE-2026-85394 has a CVSS v3 severity of CRITICAL (9.1).

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CVE-2026-85394

Description

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.