macOS 27.0 RC (26A428)

Apple software releasesSep 9, 2026 · 17:00 UTC (Sep 9, 2026)1

AI summary · glm-5.3-flashSummaries by Vani AI

Apple seeded the macOS 27.0 Release Candidate (build 26A428) to developers ahead of the final public release.

Apple published a Release Candidate build of macOS 27.0, labeled 26A428, on its developer release page. The notice only provides download and release-notes links and includes no security content, CVEs, or threat information. RC builds typically precede the general availability of the final operating system version.

Key facts

Apple released macOS 27.0 Release Candidate build 26A428 to developers.
The release notice contains no security details or CVE information.

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Tags: apple macos operating-system release-candidate software-update

Vendors: Apple
Products: macOS 27.0
Organizations: Apple

From the original article

Apple software releases

developer.apple.com

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