Yes, but it is far more tested, fuzzed, studied and battle hardened than your app code will ever be. So in the grand scheme of things it isn't a high risk for stability or security.

Yes, it would be nice if the full stack is memory safe, but that isn't a good reason to not write your own code in a memory safe language.

It has very easy binding for your own rust code, so anything you actually care about (your own code) will be memory safe.