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pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

🗓️ 05 May 2026 10:32:57Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 9 Views

PyJWT does not validate the crit header, accepting unknown extensions in JWS, violating RFC 7515.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.7x86_64fence-agents-aliyun4.10.0-98.el9_7.12fence-agents-aliyun-4.10.0-98.el9_7.12.x86_64.rpm
Red Hat Enterprise Linux9.7aarch64fence-agents-all4.10.0-98.el9_7.12fence-agents-all-4.10.0-98.el9_7.12.aarch64.rpm
Red Hat Enterprise Linux9.7ppc64lefence-agents-all4.10.0-98.el9_7.12fence-agents-all-4.10.0-98.el9_7.12.ppc64le.rpm
Red Hat Enterprise Linux9.7s390xfence-agents-all4.10.0-98.el9_7.12fence-agents-all-4.10.0-98.el9_7.12.s390x.rpm
Red Hat Enterprise Linux9.7x86_64fence-agents-all4.10.0-98.el9_7.12fence-agents-all-4.10.0-98.el9_7.12.x86_64.rpm
Red Hat Enterprise Linux9.7noarchfence-agents-amt-ws4.10.0-98.el9_7.12fence-agents-amt-ws-4.10.0-98.el9_7.12.noarch.rpm
Red Hat Enterprise Linux9.7noarchfence-agents-apc4.10.0-98.el9_7.12fence-agents-apc-4.10.0-98.el9_7.12.noarch.rpm
Red Hat Enterprise Linux9.7noarchfence-agents-apc-snmp4.10.0-98.el9_7.12fence-agents-apc-snmp-4.10.0-98.el9_7.12.noarch.rpm
Red Hat Enterprise Linux9.7x86_64fence-agents-aws4.10.0-98.el9_7.12fence-agents-aws-4.10.0-98.el9_7.12.x86_64.rpm
Red Hat Enterprise Linux9.7x86_64fence-agents-azure-arm4.10.0-98.el9_7.12fence-agents-azure-arm-4.10.0-98.el9_7.12.x86_64.rpm
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19 Jul 2026 01:07Current
7.2High risk
Vulners AI Score7.2
CVSS 3.17.5
EPSS0.00269
SSVC
CWE-347
PyJWTcritical headerjws tokenunknown extensionsheader validation
9