Nah, open source software is "use at your own risk" and there's 0 guarantee for anything. All responsibility lies with the user. If you don't like that responsibility, don't use open source software without reviewing it first.
I have a medium-sized data science project in Python. Nothing crazy. It's 180 packages, apparently, and 2.9M lines of code (whitespace, comments and all). Charitably let's call it 1m SLOC.
Seriously, you expect anyone to audit all this? It's basically impossible for any solo dev / small org, and as I say, it's not even a big project. A vulnerability is like half a line, or sometimes a typo.
Clearly, very different proposal for a large org, but even then, no small task.
