Bug 2542689 (CVE-2026-102269) - CVE-2026-102269 pyjwt: PyJWT: Token revocation bypass via non-canonical signature decoding
Summary: CVE-2026-102269 pyjwt: PyJWT: Token revocation bypass via non-canonical signa...
Keywords:
Status: NEW
Alias: CVE-2026-102269
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-28 20:46 UTC by OSIDB Bzimport
Modified: 2026-09-28 20:53 UTC (History)
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Description OSIDB Bzimport 2026-09-28 20:46:54 UTC 
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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