# CVE-2026-102269: 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.

- Web page: https://patchblox.com/security/cve/CVE-2026-102269
- Priority: Routine
- CVSS: 5.4 (Moderate)
- EPSS: 0.0022
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 28, 2026
- Weakness: Incorrect Behavior Order: Validate Before Canonicalize
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102269

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | pyjwt Debian 14 | 2.14.0-1 | [DEBIAN-CVE-2026-102269](https://patchblox.com/security/data/fix/linux/debian-cve-2026-102269.md) | Oct 4, 2026 |
| Linux | python-PyJWT opensuse-leap 16.0 | 2.12.1-160000.3.1 | [OPENSUSE-SU-2026:22074-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22074-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 15.6 | 2.8.0-150400.8.20.1 | [SUSE-SU-2026:5064-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5064-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 15.7 | 2.8.0-150400.8.20.1 | [SUSE-SU-2026:5064-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-5064-1.md) | Nov 7, 2026 |
| Linux | python-PyJWT sles 16.0 | 2.12.1-160000.3.1 | [SUSE-SU-2026:24219-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24219-1.md) | Nov 7, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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