Bug 2542310 - CVE-2026-32597 python-jwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation) [fedora-all]
Summary: CVE-2026-32597 python-jwt: PyJWT accepts unknown `crit` header extensions (RF...
Keywords:
Status: NEW
Alias: None
Product: Fedora
Classification: Fedora
Component: python-jwt
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Fedora Infrastructure SIG
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["8f05edaf-e034-47ab-8c2e-b...
Depends On:
Blocks: CVE-2026-32597
TreeView+ depends on / blocked
 
Reported: 2026-09-28 05:52 UTC by Ganesh
Modified: 2026-09-28 05:52 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:

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Description Ganesh 2026-09-28 05:52:13 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.
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