CVE-2026-102269
4.8
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| jpadilla | pyjwt | < 2.14.0 | affected |
Weaknesses
- CWE-180: CWE-180: Incorrect Behavior Order: Validate Before Canonicalize
References
- https://github.com/jpadilla/pyjwt/security/advisories/GHSA-hxm8-2xgr-2p9m
- https://github.com/jpadilla/pyjwt/commit/e6f48401001609a8f99e71fcaf355fb895d508a8
- https://github.com/jpadilla/pyjwt/releases/tag/2.14.0
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