A qbittorrent security update has been released for both Debian GNU/Linux 9 and 10 to address a command injection via shell metacharacters security issue.

DSA 4650-1: qbittorrent security update

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Debian Security Advisory DSA-4650-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 02, 2020   https://www.debian.org/security/faq
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Package : qbittorrent
CVE ID : CVE-2019-13640
Debian Bug : 932539

Miguel Onoro reported that qbittorrent, a bittorrent client with a Qt5
GUI user interface, allows command injection via shell metacharacters in
the torrent name parameter or current tracker parameter, which could
result in remote command execution via a crafted name within an RSS feed
if qbittorrent is configured to run an external program on torrent
completion.

For the oldstable distribution (stretch), this problem has been fixed
in version 3.3.7-3+deb9u1.

For the stable distribution (buster), this problem has been fixed in
version 4.1.5-1+deb10u1.

We recommend that you upgrade your qbittorrent packages.

For the detailed security status of qbittorrent please refer to its
security tracker page at:
  https://security-tracker.debian.org/tracker/qbittorrent

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/