Windows 10 update KB4586876 is intended for versions 2004 and 20H2. This update installed on my test system has been running without issue for several days.
Quality and reliability improvements
|WPF1||Addresses an issue in which a FailFast crash occurs in apps that have two threads that both load application resources.|
|Runtime||Improves the clean-up process for X509Certificate2 certificates.|
How to obtain and install the update
Install this update
|Release Channel||Available||Next Step|
|Windows Update and Microsoft Update||Yes||To download and install this update, go to Settings > Update & Security > Windows Update, and then select Check for updates.|
|Microsoft Update Catalog||Yes||To get the standalone package for this update, go to the Microsoft Update Catalog website.|
|Windows Server Update Services (WSUS)||No||You can import this update into WSUS manually. See the Microsoft Update Catalog for instructions.|
For a list of the files that are provided in this update, download the file information for cumulative update.
To apply this update, you must have .NET Framework 3.5 or 4.8 installed.
You must restart the computer after you apply this update if any affected files are being used. We recommend that you exit all .NET Framework-based applications before you apply this update.