https://www.bleepingcomputer.com/news/microsoft/windows-10-cumulative-updates-kb4579311-and-kb4577671-released/

Today is the second Tuesday of October 2020 and the first batch of security updates or 'B' updates are now available for all supported versions of Windows 10.

If you want to grab these updates, check for updates in the Settings and the update will begin installing. If you don't want to grab these fixes, make sure that you hit the pause button.