CVE-2026-91992
Published:September 15, 2026
Updated:September 22, 2026
Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.
Affected Packages
tornado (CONDA):
Affected version(s) >=2.3 <6.5.7Fix Suggestion:
Update to version 6.5.7https://github.com/tornadoweb/tornado.git (GITHUB):
Affected version(s) >=v2.0.0 <v6.5.7Fix Suggestion:
Update to version v6.5.7tornado (PYTHON):
Affected version(s) >=2.0 <6.5.7Fix Suggestion:
Update to version 6.5.7Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
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
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Exposure of Sensitive Information to an Unauthorized Actor
EPSS
Base Score:
0.21