We recently found out that Transmission is also affected by the previously mentioned torrent client vulnerability.

If you are using a Transmission version older than 2.93, you might be vulnerable to a similar exploit as the uTorrent users. We highly recommend updating to version 2.93 or above.
If you are using Transmission on Linux, your distribution repository might be backporting security updates. For example Ubuntu based distributions still come with Transmission 2.84, but the latest security patches have been applied. Please check the release history of your repo.

Install qbittorrent. Problem solved.