The festivaltts4r gem for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in a string to the (1) to_speech or (2) to_mp3 method in lib/festivaltts4r/festival4r.rb.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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