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Windows 10 1809 Windows 10 1809 Out-of-band update
Out-of-band

KB5059091

KB5059091: Cumulative update for Windows 10, version 1809, April 2025. Hyper-V-isolated containers start reliably after an image mismatch fix

In short

Fixes startup failures for some Windows containers running in Hyper-V isolation when their update level differs from the host utility virtual machine. The required servicing stack update must be installed first.

Does it affect you? Applies to: Devices running Windows 10 Enterprise LTSC 2019, version 1809, on x86 or x64.

Build
17763.7249
Restart
Required
Review notes Additional details from the official release notes (2) Read notes
  • In detail The update addresses cases where a mismatch between a container’s update level and the host utility virtual machine caused startup failures. Microsoft says it improves reliability and compatibility.
  • What changes The update addresses cases where a mismatch between a container’s update level and the host utility virtual machine caused startup failures. Microsoft says it improves reliability and compatibility.

The official sources are linked at the end of the page.

Microsoft publishes separate notes for this KB for Windows Server.

What changes

Fix 1 change

Windows containers

For: Devices running Windows containers in Hyper-V isolation mode

  • Some Windows containers running in Hyper-V isolation can start even when their update level does not match the host utility virtual machine.1
    Addresses startup failures caused by compatibility problems between system files in 2025.04 B container images and the hosting utility virtual machine (UVM).

Improvement 1 change

Servicing stack

  • The component that installs Windows updates receives quality improvements.2
    The combined servicing stack update is KB5055662, build 17763.7125.

Known issues

  1. Open Affects: Organizations and IT administrators

    Citrix

    The January 2025 Windows security update might fail to install and roll back on devices with certain Citrix components. The issue was observed with Citrix Session Recording Agent version 2411; home users are not expected to be affected.3

    How to apply the workaround Workaround

    Upgrade Citrix Session Recording Agent to version 2503 or newer.3

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-04-16
Classification
Updates
Type
Cumulative update
Restart
Required
Replaces
KB5058922, KB5050008, KB5037425
Replaced by
KB5058392
VersionBuildChannel
1809 17763.7249 General availability

Security

No vulnerabilities are listed for this update.

Updated components

98 files changed since the previous update for the same versions.

Top changed componentsFiles
Networking6
Kernel4
Graphics and display2
Hyper-V and virtualization2
Secure Boot2
Security and sign-in2

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. With this update, containers now correctly access the necessary system files from the host, improving reliability and compatibility across different Windows versions. support.microsoft.com
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
  3. 3. The issue has been resolved in Citrix Session Recording Agent version 2503, released on April 28, 2025, and newer versions. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 quoted passages · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake