Yeah you're right, I originally said no action was taken because I was going off of my recollection of the original issue 2 years ago. When Rust released this blog post (Jan 20th 2022) the same issue had been fixed already in Python. When I asked around about C++, people pasted the reference link and said it didn't need to be fixed because it was defined as UB. I stand corrected, they did fix it. And good on them for fixing it and not closing it as "spec says its fine".

It's still bad they didn't file a CVE for it, knowing that other languages did so. It reduces trust in their ecosystem.