Path traversal in Tornado - #VU149942
Published: September 15, 2026
Vulnerability identifier: #VU149942
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-22
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper path validation in tornado.web.StaticFileHandler when handling requests for paths that resolve through symbolic links. A remote attacker can request a path to a symbolic link within the static root to disclose sensitive information.
Exploitation requires a symbolic link within the static root that points outside that root.
Affected software
Tornado
Remediation
Install security update from vendor's website.
Tornado - update to 6.5.9