In qBittorrent before 4.1.7, the function Application::runExternalProgram() located in app/application.cpp allows command injection via shell metacharacters in the torrent name parameter or current tracker parameter, as demonstrated by remote command execution via a crafted name within an RSS feed.
https://www.debian.org/security/2020/dsa-4650
https://github.com/qbittorrent/qBittorrent/issues/10925
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00085.html
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00080.html