Win Update KB5012121 Cumulative Update .NET Framework 3.5 and 4.8 for Windows 11 - April 12


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April 12, 2022-KB5012121 Cumulative Update for .NET Framework 3.5 and 4.8 for Windows 11​


Summary​

Security Improvements

This security update addresses an issue where an unauthenticated attacker could cause a denial of service on an affected system. For more information please see CVE-2022-26832.

Quality and reliability improvements

Winforms- Addresses a leak of IRawElementProviderSimple objects which was introduced in .NET Framework 4.8. This is an opt-in fix, add the following compatibility switch to the app.config file in order to dispose the accessible objects:
<runtime>

<!-- AppContextSwitchOverrides values are in the form of 'key1=true|false;key2=true|false -->

<AppContextSwitchOverrides value="Switch.System.Windows.Forms.DisconnectUiaProvidersOnWmDestroy=true"/>

</runtime>
Note: that when the accessibility server application opts into this fix, the accessibility client will receive errors when accessing the disconnected provider. This is expected because the corresponding control window is destroyed. Previous behavior where the provider was returning information for destroyed controls was incorrect.
NET Libraries- Addresses an issue when Ssl negotiation can hang indefinitely when client certificates are used when TLS 1.3 is negotiated. Before the change renegotiation (PostHandshakeAuthentiction) would fail and SslStream or HttpWebRequest would observe a timeout.

Known issues in this update​

Microsoft is not currently aware of any issues in this update.

How to get this update​

Install this update

Release ChannelAvailableNext Step
Windows Update and Microsoft UpdateYesNone. This update will be downloaded and installed automatically from Windows Update.
Windows Update for BusinessYesNone. This update will be downloaded and installed automatically from Windows Update.
Microsoft Update CatalogYesTo get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)YesThis update will automatically sync with WSUS if you configure Products and Classifications as follows:
Product: Windows 11
Classification: Security Updates

File information

For a list of the files that are provided in this update, download the file information for cumulative update.

Source:

Check Windows Updates


Direct download links for KB5012121 MSU file from Microsoft Update Catalog:

Download KB5012121 MSU for Windows 11 64-bit (x64) - 46.8 MB

Download KB5012121 MSU for Windows 11 ARM64 - 46.8 MB
 

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