Security vulnerabilities and automated fixes for os security issues
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A critical OS command injection vulnerability (CWE-78) was discovered and patched in `voice.py`, where user-controlled input was interpolated directly into a shell command string passed to `os.system()`. An attacker who could influence the `device` variable — through a config file, environment variable, or any external input — could execute arbitrary system commands with the full privileges of the running process. The fix replaces the dangerous `os.system()` calls with Python's `subprocess.run()