Summary

Microsoft released a new cumulative update to Window Insider program Slow, Fast and Release Preview rings. If you have updated to Build 18356.30 or a later build – your device will be offered this build.  This update also includes updates that come as part of the normal monthly release cycle. Key changes include:

  • Provides protections against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 64-Bit (x64) versions of Windows (CVE-2019-11091, CVE-2018-12126CVE-2018-12127CVE-2018-12130). Use the registry settings as described in the Windows Client and Windows Server articles(These registry settings are enabled by default for Windows Client OS editions and Windows Server OS editions).

  • Addresses an issue that decreases Internet Explorer’s performance when you use roaming profiles or you don't use the Microsoft Compatibility List.

  • Addresses an issue that may cause the text, layout, or cell size to become narrower or wider than expected in Microsoft Excel when using the MS UI Gothic or MS PGothic fonts.

  • Adds "gov.uk" to the HTTP Strict Transport Security Top Level Domains (HSTS TLD) for Internet Explorer and Microsoft Edge.

Note: After installation, the OS build will be 18362.113.

Known issues in this update

Symptom

Workaround

After installing this update, users may experience error “0x800705b4” when launching Windows Defender Application Guard or Windows Sandbox.

Use the credentials of a local admin to create and set the following registry keys on the Host OS then restart the Host:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Containers\CmService\Policy]

"DisableClone"=dword:00000001

"DisableSnapshot"=dword:00000001

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing the May 14, 2019 update, some gov.uk websites that don’t support HTTP Strict Transport Security (HSTS) may not be accessible through Internet Explorer 11 or Microsoft Edge.

This issue is resolved in KB4505057.

When installing this update, users may receive the error, "0x800f081f - CBS_E_SOURCE_MISSING."

This issue is resolved in KB4505057.

How to get this update

To receive this update, you must be a Windows Insider (Slow, Fast or Release Preview ring) AND currently running Insider Build 18356.30 or higher for the update to be downloaded and installed automatically from Windows Update. Windows Insiders can also download the standalone package for this update. To do this go to the Microsoft Update Catalog website. 

Before installing this update

Microsoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU and applying Microsoft security fixes. For more information, see Servicing stack updates.

If you are using Windows Update, the latest SSU (KB4500109) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in Microsoft Update Catalog.

More information

Prerequisites 

You must be a Windows Insider on the Fast, Slow and Release Preview rings and be running Build 18356.30 or later.

Update replacement information 

This update replaces the previously released update 4497093.

References

To learn more about the Windows Insider Program see our blog

Learn about the terminology that Microsoft uses to describe software updates. 

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