There is an OS command injection vulnerability in Ruby Rake < 12.3.3 in Rake::FileList when supplying a filename that begins with the pipe character `|`.
https://usn.ubuntu.com/4295-1/
https://lists.debian.org/debian-lts-announce/2020/02/msg00026.html
https://hackerone.com/reports/651518
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html