CVE-2026-123534 Tornado before 6.6 Path Traversal via static_url() Version Hashing
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-123534?
CVE-2026-123534 is a high-severity vulnerability in tornadoweb tornado, published on 8 Nov 2026.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2026-123534?
How do I fix CVE-2026-123534?
Upgrade to a fixed version.
Is CVE-2026-123534 being exploited?
There is no known exploitation of CVE-2026-123534 in the wild and no public exploit code.
Sources
Also known as AZL-113104, CLEANSTART-2026-ZF35856, DEBIAN-CVE-2026-123534, GHSA-v8g8-cp5j-42fg, GHSA-xc53-2vgx-jv3x, UBUNTU-CVE-2026-123534.