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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00014.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
jpadilla pyjwt affected
Version Status Constraints
< 2.12.0 affected —

No data.

No data.

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-752w-5fwx-jx9f cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-32597 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-32597 cve-icon
History

Fri, 13 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Jpadilla
Jpadilla pyjwt
Vendors & Products Jpadilla
Jpadilla pyjwt

Fri, 13 Mar 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
References
Metrics threat_severity

None

 threat_severity

Important

Thu, 12 Mar 2026 22:00:00 +0000

Type Values Removed Values Added
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.
Title PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)
Weaknesses CWE-345
CWE-863
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-03-12T21:41:50.427Z

Reserved: 2026-03-12T14:54:24.269Z

Link: CVE-2026-32597

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-03-12T21:41:50Z

Links: CVE-2026-32597 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-13T09:49:28Z

Weaknesses