PHP is worse in this aspect with its long tail of legacy and staying close to C. It's absolutely possible that memory-unsafe Python interpreters could have something vaguely similar, but it's much less likely. Plus there are Python interpreters in memory-safe languages.

In any case, memory-unsafe codebases will continue to be a significant danger. Be it in interpreters or anywhere else. Just like they have been for the past 20+ years.

The way things are going, I imagine there are going to be vulnerabilities found in everything

A lot of PHPs issues stem from bad legacy decisions.

Probably not. PHP is so badly built these kinds of things happen frequently.