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macOS Tahoe 26.0 Beta 9 - Bug fixes, changes, and more

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The first post of this thread is a WikiPost and can be edited by anyone with the appropiate permissions. Your edits will be public.
WilliApple

WilliApple

macrumors 65816
Original poster
Feb 19, 2022
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b9.png

Release Date ― September 2, 2025
Build Number ― 25A5351b
Apple Silicon System Firmware Version ― 13822.1.2
T2 BridgeOS System Firmware Version ― Pending
New Features & Changes (Found something new? Please press "Edit" on the bottom of this post and add it here)
Resolved Issues
New Issues
(If you are encountering any issues, please press "Edit" on the bottom of this post and add it here)

Remaining Issues
  • External Hard Drives will show the icon used in Sequoia
  • Alarms may not play when your display is asleep for a long period of time (FB10086690)
    • Workaround: Make your display not fall asleep in Settings > Lock Screen > Turn display off on ____ when inactive. You can turn your brightness off.
    • Issue present since macOS 13.0
Untested Issues
  • Safari tabs blank page issue - when switching between open tabs in Safari - if you hover the mouse over the tab long enough for a mini preview to pop up, when you click the tab, the page will be blank--until you move the mouse. If you're able to click the tab before the preview, the page displays normally.
Additional Notes
  • This is not currently usable on a day-to-day basis and certain apps may not work. To see those apps, you can check this thread.
  • Please know, Memory Management has always been an issue on any OS (not just Apple's). If you believe there is a Memory Leak, please go to the Apple Menu > Restart > Restart to fix it.
  • When a new macOS release comes out, all issues automatically go to "Untested Issues" until they are moved by someone. Issues that stay in Untested for 3 releases (beta or smooth) will be removed from all future threads. When there is a new macOS release, please be sure to let us know about the issue's status by moving it to either "Remaining Issues" or "Resolved Issues"
  • macOS 26 Tahoe will be installed via a Delta Update in System Settings. Please be aware about this and the update won’t install with an installer.
  • macOS 26 is officially supported on the following devices. If your device is not listed below, it has unfortunately been dropped by Apple. Any efforts of trying to get your Mac running macOS 26, including bugs should be discussed in this thread.
    • MacBook Air: M1, M2, M3, M4
    • MacBook Pro: 2019 (16 Inch only), Intel 2020 (4 thunderbolt port only), M1, M1 Pro/M1 Max, M2, M2 Pro/M2 Max, M3/M3 Pro/M3 Max, M4/M4 Pro/M4 Max
    • Mac mini: M1, M2/M2 Pro, M4/M4 Pro
    • iMac: 5K 2020, M1, M3, M4
    • Mac Pro: 2019, M2 Ultra
    • Mac Studio: M1 Max/Ultra, M2 Max/Ultra, M3 Ultra, M4 Max
  • macOS Tahoe 26.0 Release Notes
  • macOS Tahoe Overview
  • Apple Security Updates
  • Become an Apple Beta Tester
  • Full Installer (App Store) (Pending)
  • Full Installer (Direct Download)
 
Last edited:
Does anyone know if CVE-2025-43300 was patched in this or any of the previous MacOS 26 Beta's? I can't find anything in the patch notes.
 
sumohax0r said:
Does anyone know if CVE-2025-43300 was patched in this or any of the previous MacOS 26 Beta's? I can't find anything in the patch notes.
Click to expand...
We will find out once Tahoe releases, unless this was patched in a Sequoia update then it is patched because of merging git repositories.
 
I'm hoping this one fixes my dock deciding it wants to autohide after X amount of time.

I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft support site about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
 
Last edited:
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HDJulie said:
I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
Click to expand...
I just had the update on MS 365 (Beta channel as well) and it's version 16.102, which should be the equivalent pf October 2025 Office in Windows. I would't expect legacy mode to work at all from now on, if it's been confirmed to be EOL in October.
 
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HDJulie said:
I'm hoping this one fixes my dock deciding it wants to autohide after X amount of time.

I updated to this & then had an update to Office 365. I'm on the Beta there as well. After the update, Outlook was in the new (crappy) version. I tried to revert back to legacy but it will not revert. I found a post on a Microsoft about it & the person there said to change from Beta back to Current. I tried that but I get an error with some Silverlight plugin which stops the check. However, the post also said that Legacy outlook will be permanently retired in October.
This is the article, if anyone cares:
learn.microsoft.com

Microsoft Outlook on Mac - Cannot revert back to Legacy mode - Microsoft Q&A

Hi Support! I'm assisting a user of mine who is having an issue of being unable to revert back to Legacy mode for Outlook. This is on Outlook for Mac. Upon selecting to revert, the app will restart but remain in New Mode. We have tried a restart of the…
learn.microsoft.com
Click to expand...
Well that's a bummer. I hate the new Outlook layout.

I guess I have to search for another email program.
 
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My M3 MacBook Air is locked up. It’s behaving a lot like a memory leak / RAM overload, where the UI doesn’t work except after a delay.

I got Activity Monitor to open and there is no RAM leak. I haven’t had any issues like this with DB1-8 but this is severe. Not sure yet what I’ll do about it. I already force-restarted once. Even the mouse is wonky and glitching out.
 
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Reactions: maxoakland
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