CVE-2026-121546

Description

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.

References

• https://github.com/Novik/ruTorrent
• https://github.com/Novik/ruTorrent/blob/v5.3.19/php/settings.php#L526-L541
• https://github.com/Novik/ruTorrent/blob/v5.3.19/plugins/datadir/action.php#L60
• https://github.com/Novik/ruTorrent/commit/2059ff12464b2ce14fd0f53df8d6b19fb6b8a5eb
• https://github.com/Novik/ruTorrent/issues/3474