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docs/framework/release-notes/2026/01-29-october-cumulative-update-preview.md
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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 | ||
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| _Released January 29, 2026_ | ||
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| ## Summary of what's new in this release | ||
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| - [Security improvements](#security-improvements) | ||
| - [Quality and reliability improvements](#quality-and-reliability-improvements) | ||
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| ### Security improvements | ||
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| There are no new security improvements in this release. This update is cumulative and contains all previously released security improvements. | ||
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| ### Quality and reliability improvements | ||
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| #### .NET Runtime | ||
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| Addresses an issue to add verification logic for ClickOnce to support SHA384 and SHA512. (*Applies to: .NET Framework 4.8.1*) | ||
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| 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*) | ||
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| ## Known issues in this release | ||
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| This release contains no known issues. | ||
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| ## Summary tables | ||
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| The following table outlines the updates in this release. | ||
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| | 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) | | ||
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| 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. | ||
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This page now includes an “Updated November 10, 2025” line, but the frontmatter
ms.dateis still10/14/2025. In this repo, pages that include an “Updated ...” line typically also setms.dateto the update date (for example,docs/framework/release-notes/2025/03-25-march-cumulative-update-preview.md:4). Updatems.dateto match the latest update so metadata and page content stay consistent.There was a problem hiding this comment.
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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