PyJWT: Non-canonical signature segments enable raw-token revocation bypass
CVE-2026-102269 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-102269, released October 4, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| pyjwt · Debian 14 | 2.14.0-1 | DEBIAN-CVE-2026-102269 | Oct 4, 2026 |
| python-PyJWT · opensuse-leap 16.0 | 2.12.1-160000.3.1 | OPENSUSE-SU-2026:22074-1 | Nov 7, 2026 |
| python-PyJWT · sles 15.6 | 2.8.0-150400.8.20.1 | SUSE-SU-2026:5064-1 | Nov 7, 2026 |
| python-PyJWT · sles 15.7 | 2.8.0-150400.8.20.1 | SUSE-SU-2026:5064-1 | Nov 7, 2026 |
| python-PyJWT · sles 16.0 | 2.12.1-160000.3.1 | SUSE-SU-2026:24219-1 | Nov 7, 2026 |
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