Path Traversal in Tornadoweb Tornado
CVE-2026-123534
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-v8g8-cp5j-42fg) (vendor-advisory)
- VulnCheck Advisory: Tornado before 6.6 Path Traversal via static_url() Version Hashing (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123534?
- CVE-2026-123534 is a medium-severity vulnerability in Tornadoweb Tornado, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-11-08.
- How severe is CVE-2026-123534?
- Medium severity. CVSS v3 base score is 6.5 out of 10.