Heartbleed, one of the worst bugs in terms of exploitability and reach, was a bug that many engineers would be able to spot, if they were explicitly looking for it.

That's the risk of tools like Mythos/Fable/any LLM. While a human's eyes would glaze over what looks like a standard memcpy, an LLM with the right context might instantly realize the payload length was never actually verified.

And since Heartbleed existed for years, despite the full bug existing in pretty much one file, in one of the most important libraries out there, it's right to be afraid of what other obvious bugs exist and are just waiting to be found.