CVE-2026-32597

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/13/2026

Last Modified3/19/2026

Sourcenvd

Honeypot Sightings0

Affected Products

pyjwt_project:pyjwt

Weaknesses (CWE)

CWE-345CWE-863

References

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f(security-advisories@github.com)

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.