Improper Neutralization of Special Elements used in a Command ('Command Injection')
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".
CWE-77 - Command Injection
A command injection attack involves injecting an operating system command through the data input, which gets executed on the host operating system with the privileges of the victimized application. The impact of a command injection attack may range from loss of data confidentiality and integrity to unauthorized remote access to the hosting system. The attack may cause serious data breaches and system takeover.