No, but I'd also hope that new and existing users of what's probably a popular middleware for Caddy aren't expected to read 100's of open GitHub Issues or luck upon the Trail of Bits report to know there are significant unresolved security issues and the maintainers don't have the time or resources to actually fix them.

Better know that up front, than get popped and think "What happened?".

At the very least, there should be a clear warning not to use the current version of the software. And I think it's reasonable to suggest that the main project authors should neither advertise software that's dangerously insecure nor allow it to use the main project's name (which could mislead people into assuming that it's part of the project and similarly well maintained).

I don't understand this attitude.

If you put your work in the open, advertise it as an officially supported solution, and advertise it as secure, it had better be supported and secure. You can't just put out broken software and hide behind "but you didn't pay for it so who cares." Even worse when the attitude is "it's not my fault, go fix it yourself and submit a PR."

If that is the intent, why even open source it in the first place and tell people to use it. Just keep the code private and use it for yourself.

Over the last decade I have written hundreds of thousands of lines of code for personal projects that will never see the light of day, precisely for this reason. It's not production-quality software, and it would be horrendously irresponsible for me to put it out in the open, advertise it, and tell people to use it, compromising the security of their homelabs (or worse, enterprise deployments).