No, they aren't. C++ codebases, even those who make quite a big effort to use as many analysers and checkers and sanitizers as they can, are still plagued by me

No, they aren't. C++ codebases, even those who make quite a big effort to use as many analysers and checkers and sanitizers as they can, are still plagued by memory safety issues. Rust has a measurably lower incidence of security bugs due to this (not zero, but lower). People have tried (and are still trying) to retrofit memory safety onto C++ and they have not in general been successful. There's too many sharp edges built into the current language and library design, and these tools cannot catch all the ways in which you can mess up. (What's more, Rust is substantially nicer to use than C++. The language, package manager, and compiler are all so much more straightforward than C++ that I would use it for that alone)