On my system I have a secure service that is bound to localhost for commands. I do not want it accessible to Tor. It's bound to one port, lets say 876.
I am running a hidden service that binds to one port, lets call it 12345. So 127.0.0.1:12345 is open to Tor.
How confident can I be that Tor incoming connections to my system will not be able to somehow access 127.0.0.1:876?
Is this a real concern, or just tin-foil-hat?