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Release appearance

macOS 15.8 RC 2

Full article
Release candidate

Recorded context

About this appearance

Apple seeded macOS Sequoia 15.8 RC 2 on August 24, 2026 as build 24H20, seven days after the first candidate build 24H16. This is a prerelease appearance, not a public release, and no detailed change list accompanied the report.

Date
Aug 24, 2026
Availability
available
Revision
Yes
Build
24H20

Release notes

What changed

Original editorial synthesis. Linked references appear with the claims they support and in the source ledger.

Apple released the second macOS Sequoia 15.8 candidate on August 24, 2026 as build 24H20. It followed build 24H16 by seven days and advanced the numeric portion of the build by four.[1][2]

The report describes the candidate as likely to carry important security fixes but does not provide a detailed change list. Version Record therefore records the appearance and build without converting that expectation into a documented security claim.[3][4]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. Apple rolls out macOS Tahoe 26.7 and macOS Sequoia 15.8 RCs

    9to5Mac · 2026-08-17T00:00:00Z · macOS Sequoia 15.8 first candidate, build 24H16, August 17, 2026

    Back to text ↑
  2. Second Release Candidates for macOS Tahoe 26.7 and macOS Sequoia 15.8 now available

    9to5Mac · 2026-08-24T00:00:00Z · macOS Sequoia 15.8 RC 2, build 24H20, August 24, 2026

    Back to text ↑
  3. Apple security releases

    Apple Support · Apple · 2026-07-27T00:00:00.000Z · Apple security releases table reviewed August 29, 2026; no macOS Sequoia 15.8 public row

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  4. Second Release Candidates for macOS Tahoe 26.7 and macOS Sequoia 15.8 now available

    9to5Mac · 2026-08-24T00:00:00Z · Article discussion of likely security fixes and the reported build number

    Back to text ↑
  5. Second Release Candidates for macOS Tahoe 26.7 and macOS Sequoia 15.8 now available

    9to5Mac · 2026-08-24T00:00:00Z · macOS Sequoia 15.8 RC 2, build 24H20