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Original poster
Apr 12, 2001
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Apple today released a supplemental update for macOS Catalina 10.15.5, the fifth update to the macOS Catalina operating system that was released in October 2019. The supplemental update comes a week after the release of the macOS Catalina 10.15.5 update.

macos-catalina-wallpaper.jpg

‌macOS Catalina‌ 10.15.5 is a free update that can be downloaded from the Mac App Store using the Update feature in the System Preferences app. There's also a security update for those running macOS High Sierra.

The first macOS Catalina 10.15.5 update introduced a new Battery Health Management feature designed to extend the overall lifespan of a Mac's battery by reducing the rate of chemical aging. It also included controls to fine-tune the calibration of the Pro Display XDR and an option to control Automatic Prominence in a Group FaceTime call.

The supplemental update focuses on security fixes and Apple says it should be installed by all users.
macOS Catalina 10.15.5 supplemental update provides important security updates and is recommended for all users.

Some features may not be available for all regions, or on all Apple devices. For detailed information about the security content of this update, please visit: https://support.apple.com/en-us/HT211215
According to the security notes for the update, it addresses a security flaw that could allow an application to execute arbitrary code with kernel privileges.

This is the same vulnerability that has been addressed in today's iOS 13.5.1, tvOS 13.4.6, and watchOS 6.2.6 updates, and it allowed for the unc0ver jailbreak that allegedly works on all versions of iOS, including iOS 13.5.

Article Link: Apple Releases macOS Catalina 10.15.5 Supplemental Update With Security Fix
 
Last edited:

ouimetnick

macrumors 68040
Aug 28, 2008
3,370
5,366
Beverly, Massachusetts
I’ll stay on Mojave until the next major release. I’ve upgraded to every single release of Mac OS X since Leopard. Lion was pretty bad at first, but I don’t trust Catalina. I also don’t want to have Apple Music shoves in my face either.
 

iFoure

macrumors regular
Jul 1, 2010
131
66
App Store tells me that Security Update 2020-003 is available again? I've already installed it on may 26th (I'm on High Sierra 10.13.6) So should I install it for the second time? Has Apple re-issued it or what's going on O_O
 
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kdekorte

macrumors member
Nov 11, 2016
44
30
1.59GB on my MacBook Pro 16 that was on 10.15.5, seems like a rather large supplement.
 

filchermcurr

macrumors member
Oct 17, 2016
69
145
If anybody is reading this before updating, beware: It will take an eternity to install. Snacks and/or a solid reason to go on living are recommended.

In related news, not too heavy on the firmware this time around. 2018 Mac mini got an iBridge bump and T2 firmware update, neither of which were a monumental jump in version number.
 

Barry K. Nathan

macrumors 6502
Jul 6, 2018
386
1,145
Irvine, CA, USA
App Store tells me that Security Update 2020-003 is available again? I've already installed it on may 26th (I'm on High Sierra 10.13.6) So should I install it for the second time? Has Apple re-issued it or what's going on O_O
Yes, Apple reissued it with a fix for the security hole that's used by the unc0ver jailbreak. (macOS and iOS/iPadOS are based on the same kernel, so as a general rule, if there's a security hole in the kernel on iPhones, it probably affects Macs as well.)

The weird thing is that there's an update for High Sierra, and an update for Catalina, but no update for Mojave.
 
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justme1

macrumors member
Dec 29, 2016
98
120
Peoria, AZ
I have a 2019 21.5 iMac still on 10.15.4 everything I've read points to the fact that all the 10.15.5 changes are only for laptops. Any reason that iMac people need to update? Thanks.
 

chrfr

macrumors G4
Jul 11, 2009
11,195
4,764
I have a 2019 21.5 iMac still on 10.15.4 everything I've read points to the fact that all the 10.15.5 changes are only for laptops. Any reason that iMac people need to update? Thanks.
It fixes a lot of things that aren't laptop specific. There are these: https://support.apple.com/en-us/HT210642
as well as 41 security fixes: https://support.apple.com/en-us/HT211170
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Maybe just hit a little late. I just got these for Mojave:
View attachment 920693
They're not from today.
 
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