CVE-2022-29217

Name: CVE-2022-29217
Creator: NVD / NIST
Published: 2022-05-24T15:15:07.767+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.20%

Last modified Jun 17, 2026

CVE-2022-29217 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. PyJWT is a Python implementation of RFC 7519. PyJWT supports multiple different JWT signing algorithms. EPSS estimates a 1.20% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

1.20%

64.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Pyjwt Project	Pyjwt	>= 1.5.0, < 2.4.0
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36

References

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

Timeline

Published: May 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-29217?

How severe is CVE-2022-29217?

CVE-2022-29217 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.

How do I fix CVE-2022-29217?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-29217?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST