Improper Validation of Syntactic Correctness of Input Affecting python-jwt package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.19% (8th percentile)

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  • Snyk IDSNYK-RHEL8-PYTHONJWT-20826390
  • published11 Oct 2026
  • disclosed28 Sept 2026

Introduced: 28 Sep 2026

NewCVE-2026-102269  (opens in a new tab)
CWE-1286  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 python-jwt.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-jwt package and not the python-jwt package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

PyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT signature segment is affected because signature segment decoding accepts characters outside the canonical Base64URL representation. This occurs when non-Base64URL characters are appended to a valid compact JWS signature segment. As a result, base64url_decode produces the same signature bytes for different serialized segments. Consequently, raw-token revocation checks can fail to recognize an equivalent modified token. This issue is fixed in version 2.14.0.

CVSS Base Scores

version 3.1