Bug 2542309

Summary:	CVE-2026-32597 python-jwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation) [epel-all]
Product:	[Fedora] Fedora EPEL	Reporter:	Ganesh <gnaik>
Component:	python-jwt	Assignee:	Fedora Infrastructure SIG <infra-sig>
Status:	NEW ---	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	epel10	CC:	carlwgeorge, infra-sig, kevin, msuchy
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["8f05edaf-e034-47ab-8c2e-bdbfe4584f31"]}
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2447194

Description Ganesh 2026-09-28 05:52:00 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.