Catalina 10.15.1 and Security Updates for 10.14 and 10.13 are now available (updated)

Apple has just released the first substantial update to macOS Catalina, version 10.15.1, which is available through Software Update. It’s a hefty 4.5 GB in size, giving an idea of the extensive fixes and improvements it brings.

At the same time, Apple has released Security Update 2019-001 for Mojave 10.14.6, and Security Update 2019-006 for High Sierra 10.13.6. The Mojave update is large, 1.5-2 GB.

Apple’s detailed release notes for 10.15.1 – and they are quite detailed too – are available here. Among the more major changes are the addition of HomeKit Secure Video and enabled routers, Siri privacy settings, several fixes in Photos, and in Messages, Contacts, News, Music and the TV app. Oh, and there are more than 70 new and updated emoji, in case that excites you.

Significant security fixes include a vulnerability in the App Store app, elevation of privileges in file quarantine, several kernel bugs, and more. Apple’s full listing is here.

Standalone installers are now available at the following pages: Catalina 10.15.1, Mojave Security Update 2019-001, and High Sierra Security Update 2019-006.

Although I had expected this update to bring EFI firmware updates for all Mac models, the firmware updates appear limited to those models with T2 chips, and the most recent iMacs. Those updates are included in 10.15.1 and the two Security Updates, I believe.

There is also an XProtect update, to version 2107, which I am announcing separately. Those updating to 10.15.1 will find that included in the macOS update; High Sierra and Mojave users are likely to have to obtain this separately.

Updated 1320 UTC 30 October 2019 with firmware update info.