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PyJWT is a Python implementation of JSON Web Token standards. From 2.13.0 until 2.14.0, HMACAlgorithm.from_jwk is affected because PyJWK verification path used the decoded key without applying prepare_key validation. This occurs when a trusted JWK Set contains an oct entry with an empty k value. As a result, an attacker signs an HMAC token with the same zero-length key accepted by PyJWT. Consequently, forged token can carry arbitrary authenticated claims. This issue is fixed in version 2.14.0.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Oct 14, 2026 | Sep 28, 2026 |
| Ubuntu | — | Upgrade python3-jwt (Ubuntu Pro)Upgrade python3-jwtUpgrade python-jwt (Ubuntu Pro) | Oct 14, 2026 | Oct 13, 2026 |
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