Medium severity4.8NVD Advisory· Published Sep 28, 2026· Updated Oct 6, 2026
CVE-2026-102269
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
PyJWTPyPI | < 2.14.0 | 2.14.0 |
Affected products
3Patches
Vulnerability mechanics
References
5- github.com/jpadilla/pyjwt/commit/e6f48401001609a8f99e71fcaf355fb895d508a8nvdPatchWEB
- github.com/jpadilla/pyjwt/security/advisories/GHSA-hxm8-2xgr-2p9mnvdExploitMitigationVendor AdvisoryWEB
- github.com/advisories/GHSA-hxm8-2xgr-2p9mghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-102269ghsaADVISORY
- github.com/jpadilla/pyjwt/releases/tag/2.14.0nvdProductRelease NotesWEB
News mentions
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