CVE-2026-32597
March 12, 2026
PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that PyJWT does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC. This vulnerability is fixed in 2.12.0.
Affected Packages
pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (CONDA):
Affected version(s) >=1.4.0 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.12.0Fix Suggestion:
Update to version 2.12.0pyjwt (PYTHON):
Affected version(s) >=0.1.1 <2.12.0Fix Suggestion:
Update to version 2.12.0Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.01
