Please report security issues privately through GitHub's private vulnerability reporting rather than a public issue. Expect an acknowledgment within a few days.
nightjar is an offline research and education app. It requests only the
RECORD_AUDIO permission and has no network access, so the relevant surface is
parsing of untrusted images and audio (the incoming-payload pipeline) and the
correctness of the steganography and detection code. Reports in those areas are
especially welcome.
Only the latest release receives fixes.