In lib/mini_magick/image.rb in MiniMagick before 4.9.4, a fetched remote image filename could cause remote command execution because Image.open input is directly passed to Kernel#open, which accepts a '|' character followed by a command.
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2019-13574.json"