https://www.bleepingcomputer.com/news/microsoft/windows-10-cumulative-updates-kb4592449-and-kb4592438-released/

The first batch of security updates or 'B' updates for the month of 'December 2020' is now available for all supported versions of Windows 10 including version 20H2.

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. This is because Patch Tuesday cumulative updates are downloaded and installed automatically when you try to ignore them but don't hit the pause optional.