VULNERABILITY INTELLIGENCE

CVE-2026-32597

CVSS score7.5 HIGH
EPSS probability0.28%
CISA KEVNot currently listed
Published2026-03-13
Last modified2026-09-10
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-345
  • 0b0ca135-0b70-47e7-9f44-1890c2a1c46c: CWE-347

Primary references