CVE-2026-102269
Published:September 28, 2026
Updated:October 09, 2026
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 Packages
pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.14.0Fix Suggestion:
Update to version 2.14.0pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.14.0Fix Suggestion:
Update to version 2.14.0https://github.com/jpadilla/pyjwt.git (GITHUB):
Affected version(s) >=0.1.6 <2.14.0Fix Suggestion:
Update to version 2.14.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.14.0Fix Suggestion:
Update to version 2.14.0Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.8
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Incorrect Behavior Order: Validate Before Canonicalize
EPSS
Base Score:
0.19