CVE-2026-102269 (GCVE-0-2026-102269)
Vulnerability from cvelistv5
Published
2026-09-28 20:27
Modified
2026-09-29 13:49
Severity ?
4.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Summary
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.
References
Impacted products
Vendor Product Version
jpadilla pyjwt Version: < 2.14.0
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