So check it out. KEV data is now available on GitHub, in the proper cisagov organization. I know other people mirror KEV for their projects, but who can say if they're fiddling with it along the way? With https://github.com/cisagov/kev-data, you can rest assured that it's the Real and True mirror of KEV.
https://cisa.gov/kev is still the actual authoritative source, but this GitHub mirror is a pretty close second.
I posted about this on LinkedIn since that's what people do with work stuff, apparently.