LanGuard runs un-sandboxed and toggles network interfaces, so security reports are taken seriously. Please do not open a public issue for security problems.
Instead, use GitHub's private vulnerability reporting (Security → Report a vulnerability) or email roypadina@gmail.com.
You'll get an acknowledgement within a few days. Once a fix is available it will be released and the report disclosed, with credit unless you prefer otherwise.
LanGuard requests no special privileges, runs entirely on-device, and makes no network connections of its own. Relevant areas: Wi-Fi power control (CoreWLAN), login-item registration (SMAppService), and removal of the legacy LaunchAgent.