Testing conducted by Apple in October 2020 on production 1.4GHz quad-core Intel Core i5-based 13-inch MacBook Pro systems with 8GB RAM, 256GB SSD, and prerelease macOS Big Sur. Systems tested with WPA2 Wi-Fi network connection while running on battery power, with display brightness set to 12 clicks from bottom or 75%. Testing conducted by Apple in October 2020 on production 1.4GHz quad-core Intel Core i5–based 13-inch MacBook Pro systems with 8GB of RAM, a 256GB SSD and prerelease macOS Big Sur. Systems tested with a WPA2 Wi-Fi network connection while running on battery power, with display brightness set to 12 clicks from the bottom or 75 per cent. Update from Catalina or Mojave. Apple suggests that you should have 20GB of free space on your Mac's drive before you install a new version of macOS - although you may not need that much. Apple has just published the release version of macOS Mojave on the Mac App Store. But over the first few days of release, users are likely going to face various issues while trying to update macOS through the MAS. Install macOS Catalina on Mac Direct Download UPDATE: macOS Catalina has been released.
About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
Apple security documents reference vulnerabilities by CVE-ID when possible.
For more information about security, see the Apple Product Security page.
Safari 14.0.3*
Released March 8, 2021
WebKit
Available for: macOS Catalina and macOS Mojave
Apple Software Update Catalina
Impact: Processing maliciously crafted web content may lead to arbitrary code execution
Catalina Apple Update Icloud
Description: A memory corruption issue was addressed with improved validation.
Catalina Update Apple Id
Apple Catalina Update Stuck
CVE-2021-1844: Clément Lecigne of Google’s Threat Analysis Group, Alison Huffman of Microsoft Browser Vulnerability Research
Apple Catalina Update 10.15.4
* After installing this update, the build number for Safari 14.0.3 is 14610.4.3.1.7 on macOS Mojave and 15610.4.3.1.7 on macOS Catalina.