CVE-2026-123534

high

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.

References

https://www.vulncheck.com/advisories/tornado-before-6.6-path-traversal-via-static-url-version-hashing

https://github.com/tornadoweb/tornado/security/advisories/GHSA-v8g8-cp5j-42fg

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-119419

Details

Source: Mitre, NVD

Published: 2026-11-08

Updated: 2026-11-09

Risk Information

CVSS v2

Base Score: 6.1

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 8.3

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

Severity: High

EPSS

EPSS: 0.00338