Mac bugs and fixes October 23 2026: what shipped

Which Mac known issues appeared in macOS 27.2 RC?

The Mac Observer says clean installs of macOS 27.2 RC may omit notification prompts for some apps. According to The Mac Observer, Apple names Calendar, Maps, Find My, Home and Weather as examples, while Apple’s wording leaves open the possibility of additional affected apps.

The Mac Observer explains that apps which never ask for permission can remain silent without the user noticing missing Calendar reminders or Find My alerts from those apps. Apple’s workaround, as relayed by The Mac Observer, is to open System Settings > Notifications, select every affected app, and turn on notifications for that app manually.

According to The Mac Observer, Apple also lists known issue 188643179: external-display settings might not restore correctly, and the display arrangement might change after connection. The Mac Observer says Apple lists no workaround, so I would open System Settings > Displays and verify each screen’s arrangement and settings after reconnecting it to the Mac.

Which fixes have already shipped?

Only limited fixes have shipped, according to 9to5Mac and Linuxiac; the macOS certificate-trust gap has no documented fix. According to 9to5Mac, Apple, Google and Mozilla blocked compromised intermediate certificates in their respective web browsers after private keys became discoverable.

9to5Mac says the eight compromised certificates were revoked, but macOS may continue trusting certificates already accepted because its certificate handling does not check revocation information. The report specifically identifies the built-in /usr/bin/curl utility as software that may continue trusting the compromised certificates.

According to Linuxiac, the stable Steam Client update includes a fix for a macOS crash related to opening certain browser windows and should install automatically. Linuxiac adds that the update is rolling through Steam’s stable channel, so reopening Steam is my first check before attempting any broader repair.

What remains unknown?

The full app scope, any certificate abuse, and the fix release remain unknown, according to The Mac Observer and 9to5Mac. The Mac Observer’s account says Apple gives several affected apps as examples rather than presenting a complete list of notification failures.

9to5Mac says there is currently no evidence that the compromised certificates were used in the wild. The same report describes an upcoming Apple security update as a likely route for a fix, but it does not identify a released macOS version containing one.

In my reading, no macOS 27.2 fix has shipped for either RC issue, because The Mac Observer’s account still presents both problems as Apple-listed known issues. I keep the daily sequence in my Mac bugs and fixes October 22 2026 report. Earlier context does not turn release-candidate notes into a shipped fix.

What can you do today?

Check notification permissions, verify connected displays, update Steam, and avoid assuming that browser certificate blocks also repair command-line certificate trust.

The Mac Observer’s workaround is to enable affected app notifications manually in System Settings > Notifications. I would check Calendar, Maps, Find My, Home and Weather after a clean installation, then inspect any other app whose expected alerts remain absent. The cost is the time required to review each app, while leaving the settings untouched risks continued silence from affected apps.

For external displays, The Mac Observer says Apple lists no workaround, while its practical check is to open System Settings > Displays and review every screen after connecting it to the Mac. Save no assumption about the previous arrangement. Confirm position and settings whenever the display reconnects.

Linuxiac says the Steam update should install automatically through the stable channel, but I would reopen Steam and allow the update to finish before testing browser windows again. For /usr/bin/curl, 9to5Mac provides no shipped macOS fix or vendor workaround, so I would defer optional sensitive transfers through that utility. The cost is delaying that command-line work until Apple documents a fix.