The solution command-line argument is interpolated into shell commands without sanitization (lines 53, 113). On Windows, when passed through cmd.exe /c (line 134), special characters like &, |, or > can escape the double-quote wrapping and execute arbitrary commands. For example, ./dev.cs cleanslate 'foo" & calc & "' could execute calc. While this is a local dev script requiring deliberate malicious input, it's a security anti-pattern.