Macs Get Next Security Patches in Testing
Sequoia 15.8.3 and Tahoe 26.7.3 are release candidates, with vulnerability details due at official release.
Updated on Nov. 3, 2026 in Cybersecurity
Apple has released the first release candidates of macOS Sequoia 15.8.3 and macOS Tahoe 26.7.3, both described in the release notes only as providing security fixes for Macs. The updates are at the release-candidate stage, and details on the specific vulnerabilities addressed will be published once they are officially released.
Why it matters
The release candidates follow Apple's prior Sequoia 15.8.2 and Tahoe 26.7.2 updates, which together addressed more than 150 security vulnerabilities. The pattern shows Apple shipping rapid, iterative security patches across two parallel macOS branches rather than waiting for larger point releases.
The only measured figures available are the build identifiers 24H314 for macOS Sequoia 15.8.3 and 25G416 for macOS Tahoe 26.7.3, compared with the prior 15.8.2 and 26.7.2 releases that together addressed more than 150 vulnerabilities. Apple has not yet itemized the flaws fixed in the new candidates.
The players
Apple
Apple builds macOS on its own silicon-and-software stack and ships the Sequoia and Tahoe branches to Mac users worldwide.
The details
Apple's release notes for both candidates say only that the update provides security fixes for Macs, with no per-vulnerability breakdown. Release candidates are pre-release builds distributed to testers before a final version ships, so the fixes described here are not yet in general availability. The specific vulnerabilities and their severity will be detailed when the official releases are published.
Timeline
Apple released macOS Sequoia 15.8.2 and Tahoe 26.7.2 the week before the current candidates.
Apple released the first release candidates of Sequoia 15.8.3 and Tahoe 26.7.3 on 2026-11-03.
The Tech Race
Apple is maintaining two supported macOS branches in parallel, with Sequoia 15.8.3 and Tahoe 26.7.3 both moving through release-candidate testing. Its prior 15.8.2 and 26.7.2 releases addressed more than 150 vulnerabilities, placing its security cadence alongside the rapid patch schedules competing desktop platforms run.
Mac users on Sequoia and Tahoe will receive these security fixes when the final versions ship, though no release date has been announced in the source. Until then, the candidates are aimed at testers and are not a general-availability update.
The takeaway
Watch for Apple's official release notes for macOS Sequoia 15.8.3 and Tahoe 26.7.3, which should itemize the vulnerabilities fixed in these builds. Track the macOS 27.3 beta for the additional Siri AI language support it is expected to bring.
Further reading
For more on how operating system vendors respond to vulnerabilities, see the Cybersecurity section.
