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CVE-2022-29217

Published: 24 May 2022

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.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
pyjwt
Launchpad, Ubuntu, Debian
bionic
Released (1.5.3+ds1-1ubuntu0.1)
focal
Released (1.7.1-2ubuntu2.1)
impish Ignored
(end of life)
jammy
Released (2.3.0-1ubuntu0.1)
upstream
Released (2.4.0)
Patches:
upstream: https://github.com/jpadilla/pyjwt/commit/9c528670c455b8d948aff95ed50e22940d1ad3fc

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N