CVE-2026-32597

Name: CVE-2026-32597
Creator: NVD / NIST
Published: 2026-03-13T19:55:09.5+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.20%

Last modified Jun 17, 2026

CVE-2026-32597 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Pyjwt Project	Pyjwt	< 2.12.0

References

https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9fExploit, Mitigation, Vendor Advisory
https://lists.debian.org/debian-lts-announce/2026/05/msg00008.html
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9fExploit, Mitigation, Vendor Advisory

Timeline

Published: Mar 13, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-32597?

How severe is CVE-2026-32597?

CVE-2026-32597 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2026-32597?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-32597?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST