Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVE-2026-123534
Summary
Tornado prior to 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.
- HIGH
- NETWORK
- NONE
- UNCHANGED
- NONE
- NONE
- LOW
- HIGH
CWE-22 - Path Traversal
Path traversal (or directory traversal), is a vulnerability that allows malicious users to traverse the server's root directory, gaining access to arbitrary files and folders such as application code & data, back-end credentials, and sensitive operating system files. In the worst-case scenario, an attacker could potentially execute arbitrary files on the server, resulting in a denial of service attack. Such an exploit may severely impact the integrity, confidentiality, and availability of an application.
Advisory Timeline
- Published
