When did we enter the twilight zone where bug trackers are consistently empty? The limiting factor of bug reduction is remediation, not discovery. Even developer smoke testing usually surfaces bugs at a rate far faster than they can be fixed let alone actual QA.
To be fair, the limiting factor in remediation is usually finding a reproducible test case which a vulnerability is by necessity. But, I would still bet most systems have plenty of bugs in their bug trackers which are accompanied by a reproducible test case which are still bottlenecked on remediation resources.
This is of course orthogonal to the fact that patching systems that are insecure by design into security has so far been a colossal failure.
That might have been true pre LLMs but you can literally point an agent at the queue until it’s empty now.
Bugs are not the same as (real) high severity bugs.
If you find a bug in a web browser, that's no big deal. I've encountered bugs in web browsers all the time.
You figure out how to make a web page that when viewed deletes all the files on the user's hard drive? That's a little different and not something that people discover very often.
Sure, you'll still probably have a long queue of ReDoS bugs, but the only people who think those are security issues are people who enjoy the ego boost if having a cve in their name.