Path Traversal Vulnerability in Tornado Web Server by Tornado
CVE-2026-103263

8.2HIGH

Key Information:

Vendor

Tornadoweb

Status
Tornado
Vendor
CVE Published:
1 October 2026

What is CVE-2026-103263?

Tornado versions prior to 6.5.9 are susceptible to a path traversal vulnerability in the StaticFileHandler component. This flaw allows unauthenticated attackers to exploit symbolic links located within the static root directory. If such a symlink points to a location outside of this directory, attackers can potentially gain unauthorized access to sensitive files, including configuration files, private keys, and application secrets that are accessible by the user running the application. Proper validation of file paths is crucial to mitigate this risk.

Affected Version(s)

tornado 0 < 6.5.9

tornado 6.5.9

References

https://github.com/tornadoweb/tornado/security/advisories...
vendor-advisory
https://github.com/tornadoweb/tornado/commit/437ab5f76565...
patch
https://www.vulncheck.com/advisories/tornado-before-6.5.9...
third-party-advisory

CVSS V4

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yasha-ops
iaohkut-from-NightWolf-Team
.