What’s Vulnerable › Vulnerabilities
CVE-2022-29217: Key confusion through non-blocklisted public key formats in PyJWT
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2022-05-24 · updated 2026-06-17
- Weakness: CWE-327
Description
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.
Affected products
- Fedoraproject Fedora: 35, 36
- jpadilla pyjwt: from 1.5.0 before 2.4.0 — fixed in 2.4.0
How to fix
Upgrade to a fixed version: jpadilla pyjwt 2.4.0. Check the vendor advisory for mitigations.
References
- https://github.com/jpadilla/pyjwt/commit/9c528670c455b8d948aff95ed50e22940d1ad3fc
- https://github.com/jpadilla/pyjwt/releases/tag/2.4.0
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24
- 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/9c528670c455b8d948aff95ed50e22940d1ad3fc
- https://github.com/jpadilla/pyjwt/releases/tag/2.4.0
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-ffqj-6fqr-9h24
- 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
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