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VULNERABILITIES

CVE-2026-102269 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:4.8 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/jpadilla/pyjwt/commit/e6f48401001609a8f99e71fcaf355fb895d508a8 [email protected]
https://github.com/jpadilla/pyjwt/releases/tag/2.14.0 [email protected]
https://github.com/jpadilla/pyjwt/security/advisories/GHSA-hxm8-2xgr-2p9m [email protected]

Weakness Enumeration

CWE-IDCWE NameSource
CWE-180Incorrect Behavior Order: Validate Before Canonicalize[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-102269
NVD Published Date:
Sep 28, 2026
NVD Last Modified:
Sep 30, 2026
Source:
[email protected]
CVE-2026-102269 Details - Not Deferred