diff --git a/docs/framework/release-notes/2026/08-27-august-cumulative-update-preview.md b/docs/framework/release-notes/2026/08-27-august-cumulative-update-preview.md
new file mode 100644
index 0000000000000..25c0c4fca3d49
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+++ b/docs/framework/release-notes/2026/08-27-august-cumulative-update-preview.md
@@ -0,0 +1,42 @@
+---
+title: August 2026 cumulative update preview
+description: Learn about the improvements in the .NET Framework August 2026 cumulative update preview.
+ms.date: 08/27/2026
+---
+# .NET Framework August 2026 cumulative update preview
+
+_Released August 27, 2026_
+
+## Summary of what's new in this release
+
+- [Security improvements](#security-improvements)
+- [Quality and reliability improvements](#quality-and-reliability-improvements)
+
+### Security improvements
+
+There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements.
+
+### Quality and reliability improvements
+
+#### .NET Runtime
+
+- Addresses an issue where intermittent crashes could occur in some 64-bit .NET Framework scenarios. (*Applies to: .NET Framework 4.8.1*)
+
+## Known issues in this release
+
+This release contains no known issues.
+
+## Summary tables
+
+The following table outlines the updates in this release.
+
+| Product version | Cumulative update preview |
+| --- | --- |
+| **Windows 11, version 26H1** | |
+| .NET Framework 3.5, 4.8.1 | [5122386](https://support.microsoft.com/kb/5122386) |
+| **Windows 11, version 25H2** | |
+| .NET Framework 3.5, 4.8.1 | [5122385](https://support.microsoft.com/kb/5122385) |
+| **Windows 11, version 24H2** | |
+| .NET Framework 3.5, 4.8.1 | [5122385](https://support.microsoft.com/kb/5122385) |
+
+The operating system row lists a KB that's used for update offering purposes. When the operating system KB is offered, the applicability logic determines the specific .NET Framework update(s) installed. Updates for individual .NET Framework versions are installed based on the version of .NET Framework that is already present on the device. Because of this, the operating system KB is not expected to be listed as installed updates on the device. The expected updates installed are the .NET Framework-specific version updates listed in the previous table.
diff --git a/docs/framework/release-notes/release-notes.md b/docs/framework/release-notes/release-notes.md
index 825f760c2a206..1fc8f7fff02fe 100644
--- a/docs/framework/release-notes/release-notes.md
+++ b/docs/framework/release-notes/release-notes.md
@@ -1,7 +1,7 @@
 ---
 title: .NET Framework release information
 description: Improvements in the .NET Framework servicing cumulative updates.
-ms.date: 04/14/2026
+ms.date: 08/27/2026
 ---
 # .NET Framework release notes
 
@@ -11,7 +11,8 @@ The .NET Framework updates include cumulative security and reliability improveme
 
 .NET Framework cumulative update releases are discussed in detail in the following individual release notes:
 
-* August 11, 2026 - [cumulative update](./2026/08-11-august-cumulative-update.md) **New Release**
+* August 27, 2026 - [cumulative update preview](./2026/08-27-august-cumulative-update-preview.md) **New Release**
+* August 11, 2026 - [cumulative update](./2026/08-11-august-cumulative-update.md)
 * July 14, 2026 - [cumulative update](./2026/07-14-july-cumulative-update.md)
 * May 26, 2026 - [cumulative update preview](./2026/05-26-may-cumulative-update-preview.md)
 * May 12, 2026 - [cumulative update](./2026/05-12-may-cumulative-update.md)
diff --git a/docs/framework/toc.yml b/docs/framework/toc.yml
index 705a03d45ba63..d37c85a679de3 100644
--- a/docs/framework/toc.yml
+++ b/docs/framework/toc.yml
@@ -679,6 +679,8 @@ items:
     items:
     - name: Overview and index
       href: release-notes/release-notes.md
+    - name: August 2026 cumulative update preview
+      href: release-notes/2026/08-27-august-cumulative-update-preview.md
     - name: August 2026 cumulative update
       href: release-notes/2026/08-11-august-cumulative-update.md
     - name: July 2026 cumulative update