← CVE Intelligence

CVE-2026-102269

PyJWT: Non-canonical signature segments enable raw-token revocation bypass PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
jpadilla / pyjwtaffected < 2.14.0

CWE

CWE-180

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.