> Unsafe is not necessary to trigger UB in case no_std is used

I have no idea what are you talking about, no_std is just completely irrelevant here.

> Nor if one of the soundness holes in the Rust programming language itself is encountered

Have you actually examined those soundness holes? It is basically impossible to hit them without writing code which is meant to hit them.

And this is also noted in a footnote.

> Nor if there is UB in one of the libraries used as a dependency by the library you are using

If we treat a Rust program globally, this is kinda true. A more true statement will be that UB cannot happen without unsafe code somewhere, including in dependencies (and the original statement can be interpreted as saying that).

But the true power of unsafe is that it's local. If you've reviewed a library and its unsafe is sound, you can ignore it for the rest of the calculation. And of course, the more people review a library the more likely it is that it is sound.

> Which has happened many times, since the Rust standard library is full of unsafe

And here again the post's point stands: many CVEs in std are artificial, you can't exploit them without writing a program that is meant to be exploited. Such thing will never be a CVE in C/C++'s std.

> Rust also requires libraries to be safe regarding unsafe, no matter what kind of insane input that is given to the library and that would otherwise potentially be security issues. Which is too difficult for many library authors.

That is true, that is in fact the post's point: that if they fail this, a CVE will be filled, even if exploitation is just not possible realistically.

But there is a very simple solution for library authors: don't write unsafe code! You don't need to, the vast majority of times. And if you do not have the knowledge (which indeed is more complicated than in C/C++) how to not have an unsound API, then you just should not write unsafe code.

Memory safety CVEs differ between Rust and C/C++