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

🗓️ 30 Apr 2026 10:22:28Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 11 Views

PyJWT fails to validate the Critical header parameter, allowing unknown extensions in a JWS token.

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Red Hat Enterprise Linux8.10x86_64fence-agents-aliyun4.2.1-129.el8_10.25fence-agents-aliyun-4.2.1-129.el8_10.25.x86_64.rpm
Red Hat Enterprise Linux8.10x86_64fence-agents-aliyun-debuginfo4.2.1-129.el8_10.25fence-agents-aliyun-debuginfo-4.2.1-129.el8_10.25.x86_64.rpm
Red Hat Enterprise Linux8.10aarch64fence-agents-all4.2.1-129.el8_10.25fence-agents-all-4.2.1-129.el8_10.25.aarch64.rpm
Red Hat Enterprise Linux8.10ppc64lefence-agents-all4.2.1-129.el8_10.25fence-agents-all-4.2.1-129.el8_10.25.ppc64le.rpm
Red Hat Enterprise Linux8.10s390xfence-agents-all4.2.1-129.el8_10.25fence-agents-all-4.2.1-129.el8_10.25.s390x.rpm
Red Hat Enterprise Linux8.10x86_64fence-agents-all4.2.1-129.el8_10.25fence-agents-all-4.2.1-129.el8_10.25.x86_64.rpm
Red Hat Enterprise Linux8.10noarchfence-agents-amt-ws4.2.1-129.el8_10.25fence-agents-amt-ws-4.2.1-129.el8_10.25.noarch.rpm
Red Hat Enterprise Linux8.10noarchfence-agents-apc4.2.1-129.el8_10.25fence-agents-apc-4.2.1-129.el8_10.25.noarch.rpm
Red Hat Enterprise Linux8.10noarchfence-agents-apc-snmp4.2.1-129.el8_10.25fence-agents-apc-snmp-4.2.1-129.el8_10.25.noarch.rpm
Red Hat Enterprise Linux8.10noarchfence-agents-aws4.2.1-129.el8_10.25fence-agents-aws-4.2.1-129.el8_10.25.noarch.rpm
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20 Jul 2026 04:36Current
8.5High risk
Vulners AI Score8.5
CVSS 3.17.5
EPSS0.00269
SSVC
CWE-347
PyJWT libraryCritical header parameterJWS tokenUnknown extensionsMust violationJson web token
11