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Release record

watchOS 4.3.1

Full article
Public release
Recorded milestones
6
Beta cycle
57d
Average interval
11d
Public release
May 29, 2018

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

Release overview

watchOS 4.3.1 was released on May 29, 2018 with a startup-logo correction and a substantial security repair set.[1][2]

Evidence boundary

Apple names one ordinary fix for this version. Other detail comes only from the matching advisory, and later 4.3.2 maintenance is not attributed to 4.3.1.[3][4]

Source ledger

References

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

  1. About the security content of watchOS 4.3.1

    Apple Support · Apple · 2018-05-29T00:00:00.000Z · Released May 29, 2018

    Back to text ↑
  2. About watchOS 4 Updates

    Apple Support · Apple · 2026-07-30 · watchOS 4.3.1

    Back to text ↑
  3. About the security content of watchOS 4.3.1

    Apple Support · Apple · 2018-05-29T00:00:00.000Z · watchOS 4.3.1 security content

    Back to text ↑
  4. About watchOS 4 Updates

    Apple Support · Apple · 2026-07-30 · watchOS 4.3.1 through watchOS 4.3.2

    Back to text ↑

Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

bugFix · fixed

Startup-logo hang correction

documentedconfirmed

The update addressed an intermittent boot path that prevented affected devices from progressing beyond the startup screen.

Recorded at Public

  1. [1] About watchOS 4 Updates · watchOS 4.3.1

security · fixed

watchOS 4.3.1 security repairs

documentedconfirmed

Apple's advisory records interception, privilege, code-execution, spoofing, impersonation, denial-of-service, identifier-exposure, and web-processing fixes.

Recorded at Public

  1. [1] About the security content of watchOS 4.3.1 · Bluetooth; CoreGraphics; Crash Reporter; FontParser; Kernel; libxpc; LinkPresentation; Messages; Security; UIKit; WebKit

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

  2. +14 days
  3. +15 days
  4. +6 days
  5. +7 days
  6. +15 days

    Public release

    Public

    Full articleEditorially verified

    watchOS 4.3.1 reached the public channel on May 29, 2018 with a fix for watches that could remain at the startup logo and security repairs across wireless, parsing, messaging, identity, kernel, and web surfaces.

    Availability
    available
    Sources
    4 linked
    Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Cycle vs. platform average

57d (avg: 58d)

1 days shorter than the watchOS average

Longest gap in this cycle

15 days

Between Beta 2 and Beta 3

Official release notes