RHSA-2026:93624

Vulnerability from csaf_redhat - Published: 2026-11-02 12:02 - Updated: 2026-11-05 15:21
Summary
Red Hat Security Advisory: python-jwt security update
Severity
Important
Notes
Topic: An update for python-jwt is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 ?4.1.11 MUST violation) (CVE-2026-32597) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
CVE-2026-32597

A missing verification step has been discovered in PyJWT. 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.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-347 - Improper Verification of Cryptographic Signature
Affected products
Product Identifier Version Remediation
Unresolved product id: BaseOS-8.8.0.Z.E4S:python-jwt-0:1.6.1-2.el8_8.1.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-jwt-0:1.6.1-2.el8_8.1.noarch —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.8.0.Z.TUS:python-jwt-0:1.6.1-2.el8_8.1.src —
Vendor Fix fix
Workaround
Unresolved product id: BaseOS-8.8.0.Z.TUS:python3-jwt-0:1.6.1-2.el8_8.1.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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          "text": "An IMPORTANT severity flaw was found in PyJWT, a Python JSON Web Token (JWT) library shipped in a broad set of Red Hat products, including Red Hat Ansible Automation Platform, Red Hat Enterprise Linux, Red Hat OpenShift AI and Red Hat AI Inference Server components, and Red Hat Quay. PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 section 4.1.11: when a JSON Web Signature (JWS) token contains a crit array listing header extensions that PyJWT does not understand, the library accepts the token instead of rejecting it, violating a MUST requirement of the RFC. As a result, a remote attacker who can submit crafted tokens to an application that relies on PyJWT for JWT verification can have tokens carrying unrecognized critical header extensions accepted, undermining the integrity of the token validation the application depends on. Red Hat has rated this flaw as IMPORTANT with a CVSS 3.1 score of 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), consistent with the upstream severity. Affected Red Hat product streams are tracked with a delegated resolution, and fixes are being pursued by the responsible product teams.",
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            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
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      "title": "pyjwt: PyJWT accepts unknown `crit` header extensions (RFC 7515 \u00a74.1.11 MUST violation)"
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}



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