From 87a4634e5b3ae09551d8a56762c819f2b661bca4 Mon Sep 17 00:00:00 2001 From: Tara Overfield Date: Wed, 8 Jul 2026 20:07:13 -0700 Subject: [PATCH 1/5] Add 2026.05 D release notes --- .../05-26-may-cumulative-update-preview.md | 46 +++++++++++++++++++ docs/framework/release-notes/release-notes.md | 3 +- docs/framework/toc.yml | 2 + 3 files changed, 50 insertions(+), 1 deletion(-) create mode 100644 docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md diff --git a/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md new file mode 100644 index 0000000000000..49844b0e900bd --- /dev/null +++ b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md @@ -0,0 +1,46 @@ +--- +title: May 2026 cumulative update preview +description: Learn about the improvements in the .NET Framework May 2026 cumulative update preview. +ms.date: 05/26/2026 +--- +# May 2026 cumulative update preview + +_Released May 26, 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 Libraries** + +- Addresses an issue with synchronous `HttpWebRequest` connections where requests could hang in specific secure connection scenarios with certain server configurations. + +**.NET Runtime** + +- Addresses an issue in the Visual Studio x86 native debugger where certain floating-point values could be reported incorrectly during step operations in mixed-code applications. + +## 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 4.8.1 | [5092431](https://support.microsoft.com/kb/5092431) | +| **Windows 11, version 25H2** | | +| .NET Framework 3.5, 4.8.1 | [5092427](https://support.microsoft.com/kb/5092427) | +| **Windows 11, version 24H2** | | +| .NET Framework 3.5, 4.8.1 | [5092430](https://support.microsoft.com/kb/5092430) | + +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 d5cb13b46f6b8..e097c8b21158a 100644 --- a/docs/framework/release-notes/release-notes.md +++ b/docs/framework/release-notes/release-notes.md @@ -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: -* May 12, 2026 - [cumulative update](./2026/05-12-may-cumulative-update.md) **New Release** +* May 26, 2026 - [cumulative update-preview](./2026/05-29-may-cumulative-update-preview.md) **New Release** +* May 12, 2026 - [cumulative update](./2026/05-12-may-cumulative-update.md) * April 14, 2026 - [cumulative update](./2026/04-14-april-cumulative-update.md) * February 10, 2026 - [cumulative update](./2026/02-10-february-cumulative-update.md) * January 29, 2026 - [cumulative update preview](./2026/01-29-january-cumulative-update-preview.md) diff --git a/docs/framework/toc.yml b/docs/framework/toc.yml index 9a8bd3707818b..78c32d03c1de0 100644 --- a/docs/framework/toc.yml +++ b/docs/framework/toc.yml @@ -661,6 +661,8 @@ items: items: - name: Overview and index href: release-notes/release-notes.md + - name: May 2026 cumulative update preview + href: release-notes/2026/05-26-may-cumulative-update-preview.md - name: May 2026 cumulative update href: release-notes/2026/05-12-may-cumulative-update.md - name: April 2026 cumulative update From b93f0400bff7cbb893cdfa5b887b5e9ff2849bec Mon Sep 17 00:00:00 2001 From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com> Date: Thu, 9 Jul 2026 03:31:19 +0000 Subject: [PATCH 2/5] Fix invalid link in release-notes.md: 05-29 -> 05-26 --- docs/framework/release-notes/release-notes.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/framework/release-notes/release-notes.md b/docs/framework/release-notes/release-notes.md index e097c8b21158a..a7e1aadfd26a1 100644 --- a/docs/framework/release-notes/release-notes.md +++ b/docs/framework/release-notes/release-notes.md @@ -11,7 +11,7 @@ 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: -* May 26, 2026 - [cumulative update-preview](./2026/05-29-may-cumulative-update-preview.md) **New Release** +* May 26, 2026 - [cumulative update-preview](./2026/05-26-may-cumulative-update-preview.md) **New Release** * May 12, 2026 - [cumulative update](./2026/05-12-may-cumulative-update.md) * April 14, 2026 - [cumulative update](./2026/04-14-april-cumulative-update.md) * February 10, 2026 - [cumulative update](./2026/02-10-february-cumulative-update.md) From 2977ab38cbd7681e29650884213fd2c9a8109652 Mon Sep 17 00:00:00 2001 From: Tara Overfield Date: Thu, 9 Jul 2026 09:51:12 -0700 Subject: [PATCH 3/5] Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --- docs/framework/toc.yml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/framework/toc.yml b/docs/framework/toc.yml index 78c32d03c1de0..69565dd9c2f74 100644 --- a/docs/framework/toc.yml +++ b/docs/framework/toc.yml @@ -662,7 +662,7 @@ items: - name: Overview and index href: release-notes/release-notes.md - name: May 2026 cumulative update preview - href: release-notes/2026/05-26-may-cumulative-update-preview.md + href: release-notes/2026/05-26-may-cumulative-update-preview.md - name: May 2026 cumulative update href: release-notes/2026/05-12-may-cumulative-update.md - name: April 2026 cumulative update From c58a66cfbd37b90c099bd9de93b409fd5986b347 Mon Sep 17 00:00:00 2001 From: Tara Overfield Date: Thu, 9 Jul 2026 09:54:51 -0700 Subject: [PATCH 4/5] Potential fix for pull request finding Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> --- .../2026/05-26-may-cumulative-update-preview.md | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md index 49844b0e900bd..92d11ddfafe74 100644 --- a/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md +++ b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md @@ -18,10 +18,9 @@ There are no new security improvements in this release. This update is cumulativ ### Quality and reliability improvements -**.NET Libraries** - -- Addresses an issue with synchronous `HttpWebRequest` connections where requests could hang in specific secure connection scenarios with certain server configurations. +#### .NET libraries +Addresses an issue with synchronous `HttpWebRequest` connections where requests could hang in specific secure connection scenarios with certain server configurations. **.NET Runtime** - Addresses an issue in the Visual Studio x86 native debugger where certain floating-point values could be reported incorrectly during step operations in mixed-code applications. From f4cc85346c67a7bfb9a1d7230334af4cac06170e Mon Sep 17 00:00:00 2001 From: Genevieve Warren <24882762+gewarren@users.noreply.github.com> Date: Thu, 9 Jul 2026 10:08:45 -0700 Subject: [PATCH 5/5] Apply suggestions from code review Co-authored-by: Genevieve Warren <24882762+gewarren@users.noreply.github.com> --- .../release-notes/2026/05-26-may-cumulative-update-preview.md | 3 ++- docs/framework/release-notes/release-notes.md | 2 +- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md index 92d11ddfafe74..e93d8d7edab56 100644 --- a/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md +++ b/docs/framework/release-notes/2026/05-26-may-cumulative-update-preview.md @@ -21,7 +21,8 @@ There are no new security improvements in this release. This update is cumulativ #### .NET libraries Addresses an issue with synchronous `HttpWebRequest` connections where requests could hang in specific secure connection scenarios with certain server configurations. -**.NET Runtime** + +#### .NET Runtime - Addresses an issue in the Visual Studio x86 native debugger where certain floating-point values could be reported incorrectly during step operations in mixed-code applications. diff --git a/docs/framework/release-notes/release-notes.md b/docs/framework/release-notes/release-notes.md index a7e1aadfd26a1..5742a94620b06 100644 --- a/docs/framework/release-notes/release-notes.md +++ b/docs/framework/release-notes/release-notes.md @@ -11,7 +11,7 @@ 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: -* May 26, 2026 - [cumulative update-preview](./2026/05-26-may-cumulative-update-preview.md) **New Release** +* May 26, 2026 - [cumulative update preview](./2026/05-26-may-cumulative-update-preview.md) **New Release** * May 12, 2026 - [cumulative update](./2026/05-12-may-cumulative-update.md) * April 14, 2026 - [cumulative update](./2026/04-14-april-cumulative-update.md) * February 10, 2026 - [cumulative update](./2026/02-10-february-cumulative-update.md)