CVE-2026-103263

Medium

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.

SeverityMedium

CVSS5.9

Exploit probability—

ProductTornado

PublishedOct 1, 2026

First seenOct 1, 2026

Weakness typeCWE-59Improper link resolution

How to fix

Update

tornado6.5.9 or later

Patches

github.com/tornadoweb/tornado/commit/437ab5f76565403b3403438d2e555d11f8128d32

Vendor advisories

github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r

Affected products

Product	Affected versions	Fixed in
tornadoPyPI	v < 6.5.9	6.5.9

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