The npm module "shell-quote" 1.6.0 and earlier cannot correctly escape ">" and "<" operator used for redirection in shell. Applications that depend on shell-quote may also be vulnerable. A malicious user could perform code injection.

The shell-quote package before 1.7.3 for Node.js allows command injection. An attacker can inject unescaped shell metacharacters through a regex designed to support Windows drive letters. If the output of this package is passed to a real shell as a quoted argument to a command with exec(), an attacker can inject arbitrary commands. This is because the Windows drive letter regex character class is {A-z] instead of the correct {A-Za-z]. Several shell metacharacters exist in the space between capital letter Z and lower case letter a, such as the backtick character.