Microsoft has released Windows 10 KB5059091 for Win 10 Enterprise LTSC 2019, Win 10 IoT Enterprise LTSC 2019, Windows 10 IoT Core LTSC, and Windows Server 2019, focusing on resolving issues related to container images and servicing stacks.

April 16, 2025—KB5059091 (OS Build 17763.7249) Out-of-band

Improvements

This non-security update includes quality improvements. When you install this KB:

• This update fixes an issue caused by 2025.04 B container images released on April 8, 2025 where Windows containers running in Hyper-V isolation mode could fail to start in some cases if their update level didn’t match that of the hosting utility virtual machine (UVM). The mismatch caused compatibility problems between system files, leading to startup failures. With this update, containers now correctly access the necessary system files from the host, improving reliability and compatibility across different Windows versions.

Windows 10 servicing stack update (KB5055662) - 17763.7125

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing updates.

This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. To learn more about SSUs, see  Servicing stack updates and  Servicing Stack Updates (SSU): Frequently Asked Questions.

April 16, 2025—KB5059091 (OS Build 17763.7249) Out-of-band - Microsoft Support