“Microsoft today released updates to remedy at least 398 security vulnerabilities in its Windows operating systems and supported software”
398 fixes, 42 of them critical, and this counts as a quiet month because July hit 570. Only one is known to be actively exploited, which is the number Microsoft wants quoted. The rest are bugs that shipped and sat there. AI-assisted bug hunting is credited for the surge, which means the discovery rate went up while the rate of writing them stayed exactly the same.