CVE-2026-103263

Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink

State: Published
Severity: 8.2 High
Published: Oct 1, 2026
Updated: Oct 1, 2026
Reserved: Sep 30, 2026

Description

Tornado before 6.5.9 contains a path traversal vulnerability in StaticFileHandler that follows symbolic links inside the static root without confirming the resolved target stays within it. When a symlink pointing outside the static directory exists inside it, unauthenticated attackers can request it to read files such as configuration files, private keys, and application secrets accessible to the process user.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	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	VulnCheck
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-59 Improper Link Resolution Before File Access ('Link Following')

Affected Products

Product	Versions
tornadotornadoweb	before 6.5.9Affected 6.5.9Not affected

References

GitHub Security Advisory (GHSA-c2m8-h5v5-343r)vendor-advisory
https://github.com/tornadoweb/tornado/commit/437ab5f76565403b3403438d2e555d11f8128d32patch
VulnCheck Advisory: Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlinkthird-party-advisory

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