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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-32597

PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

jpadilla pyjwt

  • < 2.12.0affected

References