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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ ms.date: 10/14/2025
# October 2025 cumulative update

_Released October 14, 2025_
_Updated November 10, 2025_
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Copilot AI Jan 30, 2026

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This page now includes an “Updated November 10, 2025” line, but the frontmatter ms.date is still 10/14/2025. In this repo, pages that include an “Updated ...” line typically also set ms.date to the update date (for example, docs/framework/release-notes/2025/03-25-march-cumulative-update-preview.md:4). Update ms.date to match the latest update so metadata and page content stay consistent.

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@copilot open a new pull request to apply changes based on this feedback

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@copilot open a new pull request to apply changes based on this feedback


## Summary of what's new in this release

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---
title: January 2026 cumulative update preview
description: Learn about the improvements in the .NET Framework January 2026 cumulative update preview.
ms.date: 01/29/2026
---
# January 2026 cumulative update preview

_Released January 29, 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 to add verification logic for ClickOnce to support SHA384 and SHA512. (*Applies to: .NET Framework 4.8.1*)

Addresses an issue in cases where the Arm64 CLR could crash when code generates and catches a NullReferenceException within the same function. (*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 25H2** | |
| .NET Framework 3.5, 4.8.1 | [5074828](https://support.microsoft.com/kb/5074828) |
| **Windows 11, version 24H2** | |
| .NET Framework 3.5, 4.8.1 | [5074831](https://support.microsoft.com/kb/5074831) |

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.
5 changes: 3 additions & 2 deletions docs/framework/release-notes/release-notes.md
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---
title: .NET Framework release information
description: Improvements in the .NET Framework servicing cumulative updates.
ms.date: 08/26/2025
ms.date: 01/29/2026
---
# .NET Framework release notes

Expand All @@ -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:

* October 28, 2025 - [cumulative update preview](./2025/10-28-october-cumulative-update-preview.md) **New Release**
* January 29, 2026 - [cumulative update preview](./2026/01-29-october-cumulative-update-preview.md) **New Release**
* October 28, 2025 - [cumulative update preview](./2025/10-28-october-cumulative-update-preview.md)
* October 14, 2025 - [cumulative update](./2025/10-14-october-cumulative-update.md)
* September 9, 2025 - [cumulative update](./2025/09-09-september-cumulative-update.md)
* August 26, 2025 - [cumulative update preview](./2025/08-26-august-cumulative-update-preview.md)
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2 changes: 2 additions & 0 deletions docs/framework/toc.yml
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href: release-notes/2025/10-14-october-cumulative-update.md
- name: October 2025 cumulative update preview
href: release-notes/2025/10-28-october-cumulative-update-preview.md
- name: January 2026 cumulative update preview
href: release-notes/2026/01-29-october-cumulative-update-preview.md
- name: What's new
href: whats-new/index.md
- name: What's new in accessibility
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