Fork the version you liked, fix security issues discovered since, remove unused features, clean it up, then rename and publish.
This, but for all software ever. In the nightmare realm we've apparently decided to settle down in we forgot the one way to make actually secure software: Run the complicated parts somewhere offline.
A security vulnerability is much less scary if the computer can't communicate with anything. It's the only way for us to get out of the pit of infinite work we've dug.