.NET Framework September 2022 Cumulative Update Preview

Salini Agarwal

[09/22/2022] revised to add known issues

Today, we are releasing the September 2022 Cumulative Update Preview for .NET Framework.

Quality and Reliability

This release contains the following quality and reliability improvements.

  • Addresses an issue of WPF apps not working with “Text Cursor Indicator” enabled when using RichTextBox.
  • Addresses an issue to allow users to adjust column width for Datagrid and Gridview controls using keybord.
  • Addresses an issue where opening a tooltip causes an ArgumentOutOfRangeException, when the app has changed the floating point control word.
  • Addresses an issue where invoking a synchronization Wait on the UI thread can lead to a render-thread failure, due to unexpected re-entrancy.
  • Addresses issues arising in TreeView (or ListBox/DataGrid with grouping enabled) when changing the underlying collection(s) while also collapsing or expanding TreeView nodes. Scrolling actions, especially “short” actions like LineUp or MouseWheelUp, can result in poor outcomes: hangs, crashes, unexpected scrolling, gaps in the display, etc.
  • Addresses an issue where DWM failures can cause WPF’s render thread to fail. An app can opt-in to the behavior of ignoring all DwmFlush errors by setting a regkey in HKCU\Software\Microsoft\Avalon.Graphics\IgnoreDwmFlushErrors or HKLM\Software\Microsoft\Avalon.Graphics\IgnoreDwmFlushErrors whose name is the full path to the .exe that wants to opt-in, and whose DWORD value is 1.
  • Enabled Narrator to focus on System.Windows.Forms.DataGridView control even if it’s empty.
  • Improved keyboard navigation in ToolStrip ComboBox and TextBox items.
  • Improved color contrast in System.Windows.Forms.DataGridView control’s link cells.
  • Addresses an issue when users interact with the Workflow Designer, they might encounter incorrectly disabled context menu items when right clicking on a variable in the component variables list.
.NET Runtime
  • Adjusted GC Heap Hard Limit configuration, as well as processor interpretation for .NET Framework container scenarios.
  • Improved reliability of managed debugging on arm64.
  • Improved security of code identified by internal compliance scans.
  • Improved deterministic output capability in ilasm.exe.
  • 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 timeout. Possible workaround is disabling TLS 1.3 either via Switch.System.Net.DontEnableTls13 AppContext or via OS registry.

1 Windows Presentation Foundation (WPF)

Known issues:

The September 2022 preview release is listed in Windows Server Update Services IT Administrators who utilize Windows Server Update Services (WSUS) might notice that these updates are listed among the updates available from WSUS. This listing is an error. Preview updates are generally only available for manual importing via to the Microsoft Update Catalog.

Home users of Windows are unlikely to experience this issue. WSUS is commonly utilized by technology administrators to deploy Microsoft product updates in managed environments.

Please note: In environments where WSUS is configured to auto-approve updates and also auto-decline superseded content, the .NET Framework September 2022 Security and Quality Rollup Update may subsequently be auto-decline and auto-expired from the client view. If this occurs, see the guidance for reinstating declined updates. Then, run an update synchronization within Microsoft Endpoint Configuration Manager, or update management environments. Environments configured to only take security updates should not reflect these symptoms.

Next steps: The September 2022 preview release is being removed from WSUS and we are working on a resolution to support customers who received these updates via WSUS inadvertently. We estimate a solution will be available in the coming days.

Getting the Update

The Cumulative Update Preview is available via Windows Update and Microsoft Update Catalog.

Note: Customers that rely on Windows Update will automatically receive the .NET Framework version-specific updates. Advanced system administrators can also take use of the below direct Microsoft Update Catalog download links to .NET Framework-specific updates. Before applying these updates, please ensure that you carefully review the .NET Framework version applicability, to ensure that you only install updates on systems where they apply.

The following table is for Windows 10, version 1809 and Windows Server 2019+ versions.

Product Version Cumulative Update
Windows 11 5017859
.NET Framework 3.5, 4.8 Catalog 5017264
.NET Framework 3.5, 4.8.1 Catalog 5017267
Microsoft server operating system version 21H2 5017860
.NET Framework 3.5, 4.8 Catalog 5017265
.NET Framework 3.5, 4.8.1 Catalog 5017268
Windows 10 21H2 5017858
.NET Framework 3.5, 4.8 Catalog 5017262
.NET Framework 3.5, 4.8.1 Catalog 5017266
Windows 10 21H1 5017857
.NET Framework 3.5, 4.8 Catalog 5017262
.NET Framework 3.5, 4.8.1 Catalog 5017266
Windows 10 Version 20H2 5017856
.NET Framework 3.5, 4.8 Catalog 5017262
.NET Framework 3.5, 4.8.1 Catalog 5017266
Windows 10 1809 (October 2018 Update) and Windows Server 2019 5017855
.NET Framework 3.5, 4.7.2 Catalog 5017270
.NET Framework 3.5, 4.8 Catalog 5017263


Previous Monthly Rollups

The last few .NET Framework Monthly updates are listed below for your convenience:


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