Bug 2447194 (CVE-2026-32597) - CVE-2026-32597 pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)
Summary: CVE-2026-32597 pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 751...
Keywords:
Status: NEW
Alias: CVE-2026-32597
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-12 22:01 UTC by OSIDB Bzimport
Modified: 2026-03-12 22:58 UTC (History)
67 users (show)

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Description OSIDB Bzimport 2026-03-12 22:01:52 UTC 
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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