CVE-2026-123534
Published:November 08, 2026
Updated:November 09, 2026
Tornado before 6.6 contains a path traversal vulnerability in RequestHandler.static_url() and get_version() that allows attackers to hash files outside static_path using ../ sequences. Attackers controlling input passed to static_url() can obtain SHA-512 hashes of readable files to confirm their existence, or reference /dev/zero to block the event loop indefinitely.
Affected Packages
tornado (CONDA):
Affected version(s) >=6.0.1 <6.6 || >=3.0.1 <6.6 || >=5.0 <6.6 || >=2.3 <6.6 || >=4.0.1 <6.6Fix Suggestion:
Update to version 6.6https://github.com/tornadoweb/tornado.git (GITHUB):
Affected version(s) >=v1.0.0 <v6.6.0 || >=v2.0.0 <v6.6.0 || >=v3.0.0 <v6.6.0 || >=v4.0.0b1 <v6.6.0 || >=v5.0.0 <v6.6.0 || >=v6.0.0b1 <v6.6.0Fix Suggestion:
Update to version v6.6.0tornado (PYTHON):
Affected version(s) >=3.0 <6.6 || >=2.0 <6.6 || =0.2 <6.6 || >=6.0a1 <6.6 || >=5.0a1 <6.6 || >=1.0 <6.6 || >=4.0 <6.6Fix Suggestion:
Update to version 6.6Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Limitation of a Pathname to a Restricted Directory
EPSS
Base Score:
0.34