CVE-2022-29217

PyJWT is a Python implementation of RFC 7519. PyJWT supports multiple different JWT signing algorithms. With JWT, an attacker submitting the JWT token can choose the used signing algorithm. The PyJWT library requires that the application chooses what algorithms are supported. The application can specify `jwt.algorithms.get_default_algorithms()` to get support for all algorithms, or specify a single algorithm. The issue is not that big as `algorithms=jwt.algorithms.get_default_algorithms()` has to be used. Users should upgrade to v2.4.0 to receive a patch for this issue. As a workaround, always be explicit with the algorithms that are accepted and expected when decoding.

• CWE-327

• https://github.com/jpadilla/pyjwt/commit/9c528670c455b8d948aff95ed50e22940d1ad3fcPatch, Third Party Advisory
• https://github.com/jpadilla/pyjwt/releases/tag/2.4.0Release Notes, Third Party Advisory
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5PK7IQCBVNLYJEFTPHBBPFP72H4WUFNX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HIYEYZRQEP6QTHT3EHH3RGFYJIHIMAO/
• https://github.com/jpadilla/pyjwt/commit/9c528670c455b8d948aff95ed50e22940d1ad3fcPatch, Third Party Advisory
• https://github.com/jpadilla/pyjwt/releases/tag/2.4.0Release Notes, Third Party Advisory
• https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24Issue Tracking, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5PK7IQCBVNLYJEFTPHBBPFP72H4WUFNX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6HIYEYZRQEP6QTHT3EHH3RGFYJIHIMAO/
• https://www.vicarius.io/vsociety/posts/risky-algorithms-algorithm-confusion-in-pyjwt-cve-2022-29217

Published

May 24, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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