watchOS 27 Security Update

What watchOS 27 Fixes

watchOS 27, released September 14, 2026, fixes 106 vulnerabilities in 49 parts of the system, according to Apple's security advisory.

Apple does not say that any of them were exploited before the fix. That makes watchOS 27 a routine security update: worth installing soon, not an emergency.

It has since been superseded: the newest security release for watchOS 27 is watchOS 27.2, from October 26, 2026, which includes these fixes.

Grouped by us from the impact Apple gives for each fix; the impact lines below are Apple's own.

Which Devices Get watchOS 27

Apple lists watchOS 27 for: Apple Watch Series 9 and later.

The watchOS 27 release page has its build numbers and release history.

How to Install watchOS 27

Open the Watch app on the paired iPhone, then General → Software Update. The watch needs to be on its charger and within range of the iPhone.

Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past watchOS 27 there is nothing to do.

Every Fix in watchOS 27

All 106 CVEs in Apple's advisory, the most serious kinds first. Each entry is the part of the system affected, Apple's description of the impact and the fix, and the CVE ID.

• AVEVideoEncoder

  A sandboxed app may be able to execute arbitrary code with kernel privileges

  A race condition was addressed with improved state management.

  CVE-2026-84607

• Bluetooth

  A remote attacker may be able to cause unexpected app termination or arbitrary code execution

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-65414

• ImageIO

  Processing an image may lead to arbitrary code execution

  An integer overflow was addressed with improved input validation.

  CVE-2026-65346

• APFS

  An app may be able to cause unexpected system termination or write kernel memory

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84523

• CoreMedia

  A sandboxed process may be able to circumvent sandbox restrictions

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-86876

• Heimdal

  An attacker in a privileged network position may be able to modify network traffic

  A cryptographic issue was addressed with improved integrity checks.

  CVE-2026-84533

• IOMobileFrameBuffer

  An app may be able to cause unexpected system termination or corrupt kernel memory

  An out-of-bounds access issue was addressed with improved bounds checking.

  CVE-2026-65398 CVE-2026-64736

• Kernel

  An app may be able to cause unexpected system termination or corrupt kernel memory

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-28968

• Kernel

  A local user may be able to cause unexpected system termination or read kernel memory

  A race condition was addressed with additional validation.

  CVE-2026-65415

• Kernel

  An app may be able to cause unexpected system termination or read kernel memory

  An out-of-bounds read was addressed with improved input validation.

  CVE-2026-65349

• Kernel

  An app may be able to cause unexpected system termination or corrupt kernel memory

  A double free issue was addressed with improved memory management.

  CVE-2026-84561

• Kernel

  An app with root privileges may be able to read uninitialized kernel memory

  A memory initialization issue was addressed with improved memory handling.

  CVE-2026-84622

• Kernel

  Connecting to a malicious NFS server may disclose kernel memory

  The issue was addressed with improved memory handling.

  CVE-2026-43687

• Kernel

  Connecting to a malicious NFS server may lead to kernel memory corruption

  A use-after-free issue was addressed with improved memory management.

  CVE-2026-43686

• Kernel

  An app may be able to determine kernel memory layout

  A memory initialization issue was addressed with improved memory handling.

  CVE-2026-65405

• Kernel

  An app may be able to disclose kernel memory

  An information disclosure issue was addressed with improved memory management.

  CVE-2026-84530

• Kernel

  A local user may be able to cause unexpected system termination or read kernel memory

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-65359

• Kernel

  An app may be able to cause unexpected system termination or corrupt kernel memory

  A race condition was addressed with improved state handling.

  CVE-2026-84507

• Kernel

  An app may be able to disclose kernel memory

  An out-of-bounds read was addressed with improved input validation.

  CVE-2026-86903

• Kernel

  An app may be able to cause unexpected system termination or corrupt kernel memory

  The issue was addressed with improved memory handling.

  CVE-2026-65330 CVE-2026-28935 CVE-2026-84599

• MediaRemote

  A sandboxed app may be able to access the System Keychain

  An authorization issue was addressed with improved state management.

  CVE-2026-84628

• Accessibility

  An app may be able to access sensitive user data

  This issue was addressed with improved data protection.

  CVE-2026-43664

• App Intents

  An app may be able to access sensitive user data

  A privacy issue was addressed with improved access restrictions.

  CVE-2026-84582

• Apple Account

  A malicious application may be able to leak sensitive user information

  An information disclosure issue was addressed with improved state management.

  CVE-2026-84586

• Audio

  An app may be able to leak sensitive user information

  A logic issue was addressed with improved checks.

  CVE-2026-65339

• copyfile

  An archive may be able to bypass Gatekeeper

  A file quarantine bypass was addressed with additional checks.

  CVE-2026-65399

• CoreMotion

  An app may be able to access motion data from headphones without user consent

  An authorization issue was addressed with improved validation.

  CVE-2026-43737

• IOSurfaceAccelerator

  An app may be able to leak sensitive kernel state

  An information leakage was addressed with additional validation.

  CVE-2026-64760

• NetworkExtension

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-43695

• Photos Storage

  An app may be able to access sensitive user data

  A permissions issue was addressed with additional restrictions.

  CVE-2026-84491

• Reminders

  An app may be able to access sensitive user data

  This issue was addressed with improved checks.

  CVE-2026-65403

• Sandbox

  An app may be able to bypass network restrictions

  A logic issue was addressed with improved validation.

  CVE-2026-84551

• Sandbox Profiles

  An app may be able to access sensitive user data

  A permissions issue was addressed with additional restrictions.

  CVE-2026-84603

• Siri

  An app may be able to access sensitive user data

  A permissions issue was addressed with additional restrictions.

  CVE-2026-86884

• Symptom Framework

  A malicious application may be able to determine a user's current location

  A privacy issue was addressed with improved private data redaction for log entries.

  CVE-2026-84513

• TCC

  An app may be able to access sensitive user data

  A logging issue was addressed with improved data redaction.

  CVE-2026-84527

• Watch App

  An app may be able to track users across apps and websites without permission

  A privacy issue was addressed with improved state management.

  CVE-2026-86904

• WebKit

  Processing maliciously crafted web content may disclose sensitive user information

  A permissions issue was addressed by removing the vulnerable code.

  CVE-2026-64753

• WebKit History

  Visiting a maliciously crafted website may leak sensitive data

  The issue was addressed with improved checks.

  CVE-2026-64778

• Wi-Fi Connectivity

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-84636

• Accelerate Framework

  Processing a maliciously crafted image may lead to unexpected process termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-86882

• Accelerate Framework

  Processing a maliciously crafted image may lead to unexpected app termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-86918

• AppleAVD

  An app may be able to cause unexpected system termination

  A use after free issue was addressed with improved memory management.

  CVE-2026-65407

• AVEVideoEncoder

  An app may be able to cause unexpected system termination

  The issue was addressed with improved checks.

  CVE-2026-65410

• AVEVideoEncoder

  An app may be able to cause unexpected system termination

  A type confusion issue was addressed with improved memory handling.

  CVE-2026-84616

• Bluetooth

  An attacker in radio range may be able to cause unexpected system termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84613

• CoreMedia

  Processing a maliciously crafted media file may lead to unexpected app termination or corrupt process memory

  A use after free issue was addressed with improved memory management.

  CVE-2026-86913

• CoreText

  Processing web content may lead to a denial-of-service

  A null pointer dereference was addressed with improved input validation.

  CVE-2026-65412

• CoreUI

  Processing a maliciously crafted file may lead to unexpected app termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84575

• CoreUI

  Processing a maliciously crafted image may lead to unexpected app termination

  A buffer overflow was addressed with improved bounds checking.

  CVE-2026-84571

• CoreUI

  Processing a maliciously crafted asset catalog may lead to unexpected process termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84511

• FontParser

  Processing a maliciously crafted font file may lead to unexpected app termination

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-84524

• Foundation

  An app may be able to cause a denial of service

  A type confusion issue was addressed with improved memory handling.

  CVE-2026-65409

• Graphics

  An app may be able to cause unexpected system termination

  A race condition was addressed with improved state handling.

  CVE-2026-84492

• ImageIO

  Processing an image may lead to a denial-of-service

  The issue was addressed with improved checks.

  CVE-2026-65347

• ImageIO

  Processing a maliciously crafted image may lead to unexpected process termination

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-86975

• ImageIO

  Processing a maliciously crafted image may lead to unexpected app termination

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-86954

• IOGPUFamily

  Processing maliciously crafted web content may lead to memory corruption

  The issue was addressed with improved memory handling.

  CVE-2026-64788

• IOKit

  An app may be able to cause unexpected system termination

  A use after free issue was addressed with improved memory management.

  CVE-2026-28969

• Kernel

  A remote attacker may be able to cause unexpected system termination

  A use after free issue was addressed with improved memory management.

  CVE-2026-65343

• Kernel

  An app may be able to cause unexpected system termination

  A race condition was addressed with improved state handling.

  CVE-2026-84630 CVE-2026-65360 CVE-2026-65358

• Kernel

  An app may be able to cause unexpected system termination

  A memory corruption issue was addressed with improved memory handling.

  CVE-2026-65377

• Kernel

  An app may be able to cause unexpected system termination

  A use after free issue was addressed with improved memory management.

  CVE-2026-65402

• Kernel

  An app may be able to cause unexpected system termination

  A type confusion issue was addressed with improved checks.

  CVE-2026-84602

• Kernel

  An app may be able to cause unexpected system termination

  A double free issue was addressed with improved memory management.

  CVE-2026-86962

• Kernel

  An app may be able to cause unexpected system termination

  A null pointer dereference was addressed with improved input validation.

  CVE-2026-86964

• libarchive

  Processing a maliciously crafted file may lead to unexpected app termination

  A heap buffer overflow was addressed with improved bounds checking.

  CVE-2026-86870

• SceneKit

  Processing a maliciously crafted 3D model may lead to memory corruption

  The issue was addressed with improved memory handling.

  CVE-2026-84632

• SceneKit

  Processing a maliciously crafted 3D model may lead to memory corruption

  An integer overflow was addressed with improved input validation.

  CVE-2026-84620

• SceneKit

  Processing a maliciously crafted 3D model may lead to memory corruption

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84546 CVE-2026-84611

• SceneKit

  Processing a maliciously crafted 3D scene may lead to unexpected process termination

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-84526

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process termination

  A logic issue was addressed with improved state management.

  CVE-2026-84635

• WebKit

  Processing maliciously crafted web content may lead to memory corruption

  The issue was addressed with improved memory handling.

  CVE-2026-65341

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process crash

  A use-after-free issue was addressed with improved memory management.

  CVE-2026-64715

• WebKit

  Processing maliciously crafted web content may lead to an unexpected process termination

  A use-after-free issue was addressed with improved memory management.

  CVE-2026-64787

• WebKit

  Processing maliciously crafted web content may lead to memory corruption

  A memory corruption issue was addressed with improved memory handling.

  CVE-2026-43794

• WebRTC

  Processing maliciously crafted web content may lead to memory corruption

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-65391

• WebRTC

  Processing maliciously crafted web content may lead to memory corruption

  An integer overflow was addressed with improved input validation.

  CVE-2026-65390

• Wi-Fi

  An attacker in physical proximity may be able to cause a denial-of-service

  An out-of-bounds write issue was addressed with improved bounds checking.

  CVE-2026-86953

• Wi-Fi

  An attacker in wireless proximity may be able to cause unexpected system termination

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-86957

• App Store

  A local app may be able to read a persistent account identifier

  A permissions issue was addressed with additional restrictions.

  CVE-2026-86888

• AuthKit

  A local app may be able to read a persistent account identifier

  A permissions issue was addressed with additional restrictions.

  CVE-2026-84583

• Bluetooth

  An app may gain unauthorized access to Bluetooth

  An authorization issue was addressed with improved state management.

  CVE-2026-84560

• CloudKit

  A local app may be able to read a persistent account identifier

  An information disclosure issue was addressed with improved state management.

  CVE-2026-86895

• CloudKit

  An app may be able to read device name

  A permissions issue was addressed with additional restrictions.

  CVE-2026-86893

• Core Bluetooth

  An app may be able to access Bluetooth device information

  An authorization issue was addressed with improved state management.

  CVE-2026-86891

• Core Bluetooth

  Processing a maliciously crafted Bluetooth packet may result in disclosure of process memory

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-112608

• CoreText

  Processing a maliciously crafted font may result in the disclosure of process memory

  An out-of-bounds read was addressed with improved bounds checking.

  CVE-2026-84596

• DeviceCheck

  An app may be able to read persistent device identifiers

  An authorization issue was addressed with improved access control.

  CVE-2026-84612

• FontParser

  Processing a maliciously crafted font may result in the disclosure of process memory

  An out-of-bounds read issue was addressed with improved input validation.

  CVE-2026-84597

• ImageIO

  Processing a maliciously crafted image may result in disclosure of process memory

  An uninitialized memory issue was addressed with improved memory initialization.

  CVE-2026-84564

• NetworkExtension

  An app may be able to identify what other apps a user has installed

  An information disclosure issue was addressed with improved state management.

  CVE-2026-84626

• Photos Storage

  An app may be able to fingerprint the user

  This issue was addressed with additional entitlement checks.

  CVE-2026-84629

• Sandbox Profiles

  An app may be able to fingerprint the user

  A permissions issue was addressed with additional sandbox restrictions.

  CVE-2026-84625

• SceneKit

  Processing a maliciously crafted file may result in disclosure of process memory

  An integer overflow was addressed with improved input validation.

  CVE-2026-84487

• Security

  An attacker with a compromised intermediate certificate authority may be able to issue certificates with arbitrary extended key usages

  A certificate validation issue was addressed with improved certificate validation.

  CVE-2026-86881

• Shortcuts

  A malicious shortcut may be able to send messages without user confirmation

  An authorization issue was addressed with improved state management.

  CVE-2026-84600

• Software Update

  An app may be able to modify protected system files

  A permissions issue was addressed with improved path validation.

  CVE-2026-84609

• TCC

  An app may be able to modify protected system files

  A path traversal issue was addressed with improved input validation.

  CVE-2026-86886

• WebKit

  Processing maliciously crafted web content may lead to unexpected behavior

  A logic issue was addressed with improved state management.

  CVE-2026-86872

watchOS 27 Security Release History

watchOS 27 in context: the security releases Apple has published for watchOS 27, newest first, with the number of fixes each carried.

The Same Fixes Elsewhere

Apple ships most fixes to every platform that shares the code, and to older versions still under support. These releases close at least one of the same CVEs:

Frequently Asked Questions