CVE-2026-103263: Improper Link Resolution Before File Access ('Link Following') in tornadoweb tornado
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.
AI Analysis
Technical Summary
CVE-2026-103263 is a path traversal vulnerability in Tornado's StaticFileHandler prior to version 6.5.9. The vulnerability arises because the handler follows symbolic links inside the static root directory without verifying that the resolved target remains within that directory. This allows an attacker to craft requests for symlinks that point outside the static directory, potentially exposing sensitive files accessible to the process user.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to read arbitrary files on the server that are accessible to the Tornado process user, including sensitive configuration files, private keys, and application secrets. This could lead to information disclosure and compromise of the application or server environment.
Mitigation Recommendations
Upgrade Tornado to version 6.5.9 or later, where this vulnerability has been fixed. No other mitigation is indicated in the provided data.
CVE-2026-103263: Improper Link Resolution Before File Access ('Link Following') in tornadoweb tornado
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.
CVSS v4.0
Score 8.2high
Affected software
tornadoweb
tornado
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103263 is a path traversal vulnerability in Tornado's StaticFileHandler prior to version 6.5.9. The vulnerability arises because the handler follows symbolic links inside the static root directory without verifying that the resolved target remains within that directory. This allows an attacker to craft requests for symlinks that point outside the static directory, potentially exposing sensitive files accessible to the process user.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to read arbitrary files on the server that are accessible to the Tornado process user, including sensitive configuration files, private keys, and application secrets. This could lead to information disclosure and compromise of the application or server environment.
Mitigation Recommendations
Upgrade Tornado to version 6.5.9 or later, where this vulnerability has been fixed. No other mitigation is indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-30T10:58:33.572Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6abe7494a43b0b3b89bd1cf7
Added to database: 10/01/2026, 14:56:20 UTC
Last enriched: 10/01/2026, 15:22:49 UTC
Last updated: 10/01/2026, 19:41:31 UTC
Views: 3
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