watchOS 26.6 Security Update

What watchOS 26.6 Fixes

watchOS 26.6, released July 27, 2026, fixes 106 vulnerabilities in 38 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 26.6 a routine security update: worth installing soon, not an emergency.

It is the newest security release for watchOS 26 on Apple's list.

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

Which Devices Get watchOS 26.6

Apple lists watchOS 26.6 for: Apple Watch Series 6 and later.

How to Install watchOS 26.6

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 26.6 there is nothing to do.

Every Fix in watchOS 26.6

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

  An app may be able to execute arbitrary code with kernel privileges

  A buffer overflow was addressed with improved size validation.

  CVE-2026-64747

• SceneKit

  Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution

  An integer overflow was addressed with improved input validation.

  CVE-2026-64766 CVE-2026-64765

• SceneKit

  Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution

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

  CVE-2026-64764

• SceneKit

  Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution

  An out-of-bounds write issue was addressed by removing the vulnerable code.

  CVE-2026-64763

• IOKit

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

  A race condition was addressed with improved state handling.

  CVE-2026-43805

• Kernel

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

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

  CVE-2026-43778

• Kernel

  An app may be able to disclose kernel memory

  The issue was addressed with improved memory handling.

  CVE-2026-64709

• Kernel

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

  A buffer overflow was addressed with improved bounds checking.

  CVE-2026-28931

• Kernel

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

  The issue was addressed with improved input sanitization.

  CVE-2026-43724

• Kernel

  A remote user may be able to cause unexpected system termination or corrupt kernel memory

  The issue was addressed with improved memory handling.

  CVE-2026-43810

• Kernel

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

  This issue was addressed with improved input validation.

  CVE-2026-39868

• Kernel

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

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

  CVE-2026-64751

• Kernel

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

  The issue was addressed with improved memory handling.

  CVE-2026-65357

• Kernel

  An app may be able to disclose kernel memory

  This issue was addressed with improved redaction of sensitive information.

  CVE-2026-65371

• 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-2026-64717

• libc

  A malicious app may be able to break out of its sandbox

  An integer overflow was addressed with improved input validation.

  CVE-2026-28973

• MediaRemote

  An app may be able to gain root privileges

  A path handling issue was addressed with improved validation.

  CVE-2026-43723

• WebKit

  An app may be able to read files outside of its sandbox

  An access issue was addressed with improved access restrictions.

  CVE-2026-43821

• WebKit

  A malicious website may be able to process restricted web content outside the sandbox

  The issue was addressed with improved input validation.

  CVE-2026-43725

• WebKit

  Maliciously crafted web content may violate iframe sandboxing policy

  A permissions issue was addressed with improved validation.

  CVE-2026-64728

• WebKit

  A malicious website may be able to process restricted web content outside the sandbox

  The issue was addressed with improved checks.

  CVE-2026-43701

• App Store

  An app may be able to access sensitive user data

  This issue was addressed with improved checks.

  CVE-2026-43801

• CloudAttestation

  A maliciously crafted app may be able to bypass code signing enforcement

  A validation issue was addressed with improved input sanitization.

  CVE-2026-43813

• Contacts

  An app may be able to add contacts without user authorization

  An authorization issue was addressed with improved validation.

  CVE-2026-64746

• Contacts

  Processing a maliciously crafted contact may leak sensitive data

  The issue was addressed with improved checks.

  CVE-2026-64734

• CoreMedia

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-43759

• curl

  Authentication credentials may be sent to a server on another origin

  This is a vulnerability in open source code and Apple Software is among the affected projects. The CVE-ID was assigned by a third party. Learn more about the issue and CVE-ID at cve.org .

  CVE-2026-3784 CVE-2026-3783

• Data Detectors UI

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-43758

• Foundation

  A malicious app may be able to access protected user data

  The issue was addressed with improved input sanitization.

  CVE-2026-43714

• FrontBoard

  An app may be able to access sensitive user data

  This issue was addressed by using HTTPS when sending information over the network.

  CVE-2026-64742

• Game Center

  An app may be able to access sensitive user data

  This issue was addressed with improved data protection.

  CVE-2026-43796

• Kernel

  A remote attacker may be able to bypass network filters

  An inconsistent user interface issue was addressed with improved state management.

  CVE-2026-64735

• Kernel

  An app may be able to access sensitive user data

  This issue was addressed through improved state management.

  CVE-2026-64721

• Managed Configuration

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-64743

• Siri

  An app may be able to access sensitive user data

  An information disclosure issue was addressed by removing the vulnerable code.

  CVE-2026-43800

• WebKit

  Processing maliciously crafted web content may disclose sensitive user information

  A path handling issue was addressed with improved validation.

  CVE-2026-43732

• WebKit

  Visiting a website may leak sensitive data

  A permissions issue was addressed with additional restrictions.

  CVE-2026-43713

• WebKit

  Processing maliciously crafted web content may disclose sensitive user information

  A cross-origin issue was addressed with improved tracking of security origins.

  CVE-2026-43700

• WebKit

  A malicious website may exfiltrate data cross-origin

  The issue was addressed with improved checks.

  CVE-2026-43735

• WebKit

  Visiting a website that frames malicious content may lead to UI spoofing

  The issue was addressed with improved UI.

  CVE-2026-64730

• WebKit

  A malicious website may exfiltrate data cross-origin

  The issue was addressed with improved input validation.

  CVE-2026-43708

• Apple Neural Engine

  An app may be able to cause unexpected system termination

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

  CVE-2026-28928

• 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

• Audio

  An app may be able to cause a denial-of-service

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

  CVE-2026-64725

• CoreAudio

  Processing a maliciously crafted audio file may corrupt process memory

  The issue was addressed with improved memory handling.

  CVE-2026-43673

• CoreAudio

  A remote attacker may be able to cause unexpected system termination

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

  CVE-2026-43803

• CoreMedia

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

  A memory corruption issue was addressed with improved memory handling.

  CVE-2026-43711

• CoreMedia Video Toolbox

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

  The issue was addressed with improved memory handling.

  CVE-2026-43702

• Heimdal

  An app may be able to cause a denial-of-service

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

  CVE-2026-64692

• ImageIO

  Processing a maliciously crafted texture may lead to unexpected app termination

  An integer overflow was addressed with improved input validation.

  CVE-2026-43780

• ImageIO

  Processing a maliciously crafted image may corrupt process memory

  The issue was addressed with improved memory handling.

  CVE-2026-64716

• ImageIO

  Processing a maliciously crafted file may lead to unexpected app termination

  The issue was addressed with improved bounds checks.

  CVE-2026-64758

• ImageIO

  Processing a maliciously crafted file may lead to a denial-of-service

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

  CVE-2026-64754

• ImageIO

  Processing a maliciously crafted image may lead to a denial-of-service

  A type confusion issue was addressed with improved checks.

  CVE-2026-64693

• IOGPUFamily

  An app may be able to cause unexpected system termination

  A race condition was addressed with improved state handling.

  CVE-2026-43743

• Kernel

  An app may be able to cause unexpected system termination

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

  CVE-2026-43739 CVE-2026-43816

• Kernel

  An app may be able to cause unexpected system termination

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

  CVE-2026-43822 CVE-2026-64729 CVE-2026-43814 CVE-2026-64700 CVE-2026-43799

• Kernel

  An app may be able to cause unexpected system termination

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

  CVE-2026-43817

• Kernel

  An app may be able to cause unexpected system termination

  An integer overflow was addressed with improved input validation.

  CVE-2026-43769

• Kernel

  An app may be able to cause unexpected system termination

  A memory initialization issue was addressed with improved memory handling.

  CVE-2026-64775

• Kernel

  An app may be able to cause unexpected system termination

  A race condition was addressed with improved state handling.

  CVE-2026-64720

• Kernel

  An app may be able to cause unexpected system termination

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

  CVE-2026-43808

• Libnotify

  An attacker may be able to cause unexpected app termination

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

  CVE-2026-64739

• libxslt

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

  A double free issue was addressed with improved memory management.

  CVE-2026-43706

• libxslt

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

  The issue was addressed with improved memory handling.

  CVE-2026-43703

• mDNSResponder

  An attacker on the local network may be able to cause a denial-of-service

  The issue was addressed with improved memory handling.

  CVE-2026-64724

• MobileAccessoryUpdater

  A malicious accessory may be able to cause unexpected app termination

  A buffer overflow was addressed with improved bounds checking.

  CVE-2026-43807

• Web Extensions

  A malicious web extension may be able to cause an unexpected process crash

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

  CVE-2026-43704

• 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-2026-43734 CVE-2026-43726 CVE-2026-43709 CVE-2026-43742 CVE-2026-43699

• WebKit

  Processing maliciously crafted web content may lead to memory corruption

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

  CVE-2026-43731 CVE-2026-43715

• WebKit

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

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

  CVE-2026-43727 CVE-2026-64783

• WebKit

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

  The issue was addressed with improved memory handling.

  CVE-2026-43663 CVE-2026-39872 CVE-2026-43712

• WebKit

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

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

  CVE-2026-43676

• WebKit

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

  A memory corruption issue was addressed with improved state management.

  CVE-2026-64757

• WebKit

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

  A memory corruption issue was addressed with improved memory handling.

  CVE-2026-43707

• WebKit

  Processing maliciously crafted web content may lead to memory corruption

  A type confusion issue was addressed with improved checks.

  CVE-2026-43705

• WebKit

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

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

  CVE-2026-43745

• WebKit Canvas

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

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

  CVE-2026-43720 CVE-2026-64718

• WebRTC

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

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

  CVE-2026-28979

• WebRTC

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

  A stack overflow was addressed with improved input validation.

  CVE-2026-43718

• WebRTC

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

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

  CVE-2026-43717

• WebRTC

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

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

  CVE-2026-64719

• Wi-Fi

  An attacker in physical proximity may be able to corrupt process memory

  The issue was addressed with improved memory handling.

  CVE-2026-64726

• Accounts Framework

  An app may be able to fingerprint the user

  This issue was addressed with improved data protection.

  CVE-2026-64733

• AuthKit

  An app may be able to fingerprint the user

  A permissions issue was addressed with additional restrictions.

  CVE-2026-43730

• CoreAudio

  Processing an audio stream in a maliciously crafted media file may terminate the process

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

  CVE-2026-43744

• Sandbox Profiles

  An app may be able to read a persistent device identifier

  A permissions issue was addressed with additional restrictions.

  CVE-2026-64741

• WebKit

  Processing maliciously crafted web content may result in the disclosure of process memory

  The issue was addressed with improved memory handling.

  CVE-2026-43740

• WebKit

  Websites may know if the user has visited a given link

  This issue was addressed with improved checks.

  CVE-2026-64713

• WebKit Storage

  A malicious website may be able to silently hijack clipboard data

  This issue was addressed through improved state management.

  CVE-2026-43721

watchOS 26 Security Release History

watchOS 26.6 in context: the security releases Apple has published for watchOS 26, 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