CyberRota Analysis
AI-GeneratedThe vulnerability affects PyJWT versions 2.13.0 to 2.14.0, where the HMACAlgorithm.from_jwk function improperly handles JWKs with empty keys, allowing attackers to forge HMAC tokens with arbitrary claims. This could lead to unauthorized access or manipulation of sensitive data in applications relying on PyJWT for authentication. Organizations using affected versions should prioritize upgrading to version 2.14.0 or later to mitigate the risk of token forgery.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
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.
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