Apple began distributing major software updates across its device platforms on September 14, including iOS 27, iPadOS 27, macOS 27, watchOS 27, tvOS 27 and visionOS 27.
The releases introduce new system features, but they also form Apple's principal security-maintenance cycle for supported devices. Apple's security updates page lists the new operating-system versions and related platform releases as available on September 14.
The updates cover a wide range of Apple hardware and address security issues across system components. Apple generally publishes detailed vulnerability information through its security-releases documentation as fixes become available.
The release is significant because of Apple's large installed base and the number of operating systems distributed simultaneously. Organizations managing Apple fleets were advised to review compatibility, test the updates and apply them through their normal device-management processes.