If your main concern is security bugs, then according to Microsoft[0] about 70% of their bugs were memory-safety related.
[0]: https://msrc-blog.microsoft.com/2019/07/22/why-rust-for-safe...
[0]: https://msrc-blog.microsoft.com/2019/07/22/why-rust-for-safe...
The article we've all supposedly read (but clearly some have not) is specifically talking about software written in a mix of C/C++ and Python.