CVE-2026-102274
Published:September 28, 2026
Updated:October 09, 2026
PyJWT is a Python implementation of JSON Web Token standards. From 2.9.0 until 2.14.0, PyJWKSet does not catch the plain ValueError raised for malformed RSA JWK components by RSAAlgorithm.from_jwk in jwt/api_jwk.py. This occurs when a JWK Set contains a malformed RSA key alongside otherwise usable keys. As a result, one malformed member aborts construction of the entire PyJWKSet. Consequently, applications can experience authentication failures or request-level denial of service. This issue is fixed in version 2.14.0.
Affected Packages
pyjwt (CONDA):
Affected version(s) >=2.9.0 <2.14.0Fix Suggestion:
Update to version 2.14.0https://github.com/jpadilla/pyjwt.git (GITHUB):
Affected version(s) >=2.9.0 <2.14.0Fix Suggestion:
Update to version 2.14.0pyjwt (PYTHON):
Affected version(s) >=2.9.0 <2.14.0Fix Suggestion:
Update to version 2.14.0Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Handling of Exceptional Conditions
EPSS
Base Score:
0.39