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CVE-2026-48526

7.4 high SSVC exploitation: poc Modified
NVD · CVE.org

PyJWT is a JSON Web Token implementation in Python. Prior to 2.13.0, when the verifier is decoding JSON Web Tokens, while supporting both asymmetric and HMAC algorithms, the library does not validate use of JSON Web Keys in HMAC algorithm, allowing attacker to use the issuer public key as the secret key for HMAC algorithm. This vulnerability is fixed in 2.13.0.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.4 · pyjwt_projectNVD modified 2026-10-26 13:10

Affected (CPE criteria) 1

  • cpe:2.3:a:pyjwt_project:pyjwt:*:*:*:*:*:*:*:*

References 38