This is what happens when many people hype about a technology that solves a specific class of vulnerabilities, but it is not designed to prevent the others such as logic errors because of human / AI error.

Granted, the uutils authors are well experienced in Rust, but it is not enough for a large-scale rewrite like this and you can't assume that it's "secure" because of memory safety.

In this case, this post tells us that Unix itself has thousands of gotchas and re-implementing the coreutils in Rust is not a silver bullet and even the bugs Unix (and even the POSIX standard) has are part of the specification, and can be later to be revealed as vulnerabilities in reality.