Vulnerabilities CVE-2026-32597

CVE-2026-32597

High

Open

TLP:CLEAR

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

NVD CVE.org

Critical Infrastructure

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.27%

18.9th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Confidence: 90%
Published: Mar 12, 2026
Last Modified: Aug 12, 2026

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