April 2019 Patch Tuesday rollout also brings new cumulative updates for Windows 10, including for the latest stable version known as the October 2018 Update.Also referred to as Windows 10 version 1809, the October update is available for all users, and it can be installed from Windows Update on any compatible device.
The cumulative update for this particular OS version is KB4493509, and it increases the OS build number to 17763.437. The OS build number also helps check whether the update installed correctly, and you can check it out by typing winver in the Start menu.What’s new in this updateOne of the most important things about cumulative update KB4493509 is that it lands on a Patch Tuesday, which means that as compared to the other updates shipped throughout the month, its main purpose is to resolve security issues in Windows 10.
So yes, KB4493509 does patch security vulnerabilities in the operating system, including in Edge and Internet Explorer, but also in the WSL, the Scripting engine, and other components.
You can check out the full changelog in the box at the end of the article for full information on what’s being repaired in this cumulative update.
This update resolves issues in the previous cumulative updates, including a fatal crash experienced due to per font EUDC.
“Addresses an issue that occurs when you enable per font end-user-defined characters (EUDC). The system will stop working and a blue screen will appear at startup. This is not a common setting in non-Asian regions,” Microsoft says.
KB4493509 installed correctly on testing systems, but as we learned the hard way, we should wait for a few hours before determining whether a cumulative update is safe to install or not. Typically, such issues are discovered in the first 24 to 48 hours after the rollout is released .