What’s Vulnerable › Vulnerabilities

CVE-2026-103263: Tornado before 6.5.9 StaticFileHandler Path Traversal via Symlink

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-01 · updated 2026-10-01
• Weakness: CWE-59

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.

Affected products

• Pypi Tornado: before 6.5.9; 0.2, 1.0, 1.1, 1.1.1, 1.2, 1.2.1 (+78) — fixed in 6.5.9
• tornadoweb tornado: before 6.5.9 — fixed in 6.5.9

How to fix

Upgrade to a fixed version: Pypi Tornado 6.5.9; tornadoweb tornado 6.5.9. Check the vendor advisory for mitigations.

References

• https://github.com/tornadoweb/tornado/commit/437ab5f76565403b3403438d2e555d11f8128d32
• https://github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r
• https://www.vulncheck.com/advisories/tornado-before-6.5.9-staticfilehandler-path-traversal-via-symlink
• https://github.com/tornadoweb/tornado/security/advisories/GHSA-c2m8-h5v5-343r

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