The issue affects the ps-kill package, where an attacker can execute arbitrary commands if attacker-controlled user input is given to the `kill` function. This is due to the use of the `child process` `exec` function without input sanitization in the `index.js` file. A proof of concept (PoC) demonstrates this vulnerability by using the `kill` function with a malicious input, such as `$(touch success)`, which can lead to arbitrary command execution.