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

🗓️ 06 May 2026 06:40:52Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 10 Views

PyJWT does not validate the critical header parameter, accepting unknown extensions and violating standards.

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Red Hat Enterprise Linux10.1x86_64fence-agents-aliyun4.16.0-13.el10_1.4fence-agents-aliyun-4.16.0-13.el10_1.4.x86_64.rpm
Red Hat Enterprise Linux10.1aarch64fence-agents-all4.16.0-13.el10_1.4fence-agents-all-4.16.0-13.el10_1.4.aarch64.rpm
Red Hat Enterprise Linux10.1ppc64lefence-agents-all4.16.0-13.el10_1.4fence-agents-all-4.16.0-13.el10_1.4.ppc64le.rpm
Red Hat Enterprise Linux10.1s390xfence-agents-all4.16.0-13.el10_1.4fence-agents-all-4.16.0-13.el10_1.4.s390x.rpm
Red Hat Enterprise Linux10.1x86_64fence-agents-all4.16.0-13.el10_1.4fence-agents-all-4.16.0-13.el10_1.4.x86_64.rpm
Red Hat Enterprise Linux10.1noarchfence-agents-amt-ws4.16.0-13.el10_1.4fence-agents-amt-ws-4.16.0-13.el10_1.4.noarch.rpm
Red Hat Enterprise Linux10.1noarchfence-agents-apc4.16.0-13.el10_1.4fence-agents-apc-4.16.0-13.el10_1.4.noarch.rpm
Red Hat Enterprise Linux10.1noarchfence-agents-apc-snmp4.16.0-13.el10_1.4fence-agents-apc-snmp-4.16.0-13.el10_1.4.noarch.rpm
Red Hat Enterprise Linux10.1x86_64fence-agents-aws4.16.0-13.el10_1.4fence-agents-aws-4.16.0-13.el10_1.4.x86_64.rpm
Red Hat Enterprise Linux10.1x86_64fence-agents-azure-arm4.16.0-13.el10_1.4fence-agents-azure-arm-4.16.0-13.el10_1.4.x86_64.rpm
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02 Aug 2026 00:34Current
6.6Medium risk
Vulners AI Score6.6
CVSS 3.17.5
EPSS0.00269
SSVC
CWE-347
python json web tokencritical headerunknown extensionsvalidation missingsecurity flaw
10