Novik ruTorrent up to 5.3.19 datadir plugin correctDirectory path traversal

Summaryinfo

A vulnerability was found in Novik ruTorrent up to 5.3.19. It has been declared as critical. Affected by this vulnerability is the function correctDirectory of the component datadir plugin. Executing a manipulation can lead to path traversal. This vulnerability appears as CVE-2026-121546. The attack may be performed from remote. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Novik ruTorrent up to 5.3.19. This vulnerability affects the function correctDirectory of the component datadir plugin. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

ruTorrent before 5.3.20 contains a path traversal vulnerability in the datadir plugin that allows authenticated users to escape the topDirectory jail because correctDirectory() does not resolve symbolic links. Attackers can submit a datadir path through a symlink under their top directory to create directories and move torrent data to locations writable by the web server or rtorrent.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-121546 since 11/03/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1006.

Upgrading to version 5.3.20 eliminates this vulnerability.

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Productinfo

Type

• Peer-to-Peer Software

Vendor

• Novik

Name

• ruTorrent

Version

• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.3.7
• 5.3.8
• 5.3.9
• 5.3.10
• 5.3.11
• 5.3.12
• 5.3.13
• 5.3.14
• 5.3.15
• 5.3.16
• 5.3.17
• 5.3.18
• 5.3.19

Website

• Product: https://github.com/Novik/ruTorrent/

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