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APPLE-SA-03-24-2026-7 watchOS 26.4

watchOS 26.4 addresses the following issues.
Information about the security content is also available at
https://support.apple.com/126798.

Apple maintains a Security Releases page at
https://support.apple.com/100100 which lists recent
software updates with security advisories.

802.1X
Available for: Apple Watch Series 6 and later
Impact: An attacker in a privileged network position may be able to
intercept network traffic
Description: An authentication issue was addressed with improved state
management.
CVE-2026-28865: Héloïse Gollier and Mathy Vanhoef (KU Leuven)

Accounts
Available for: Apple Watch Series 6 and later
Impact: An app may be able to access sensitive user data
Description: An authorization issue was addressed with improved state
management.
CVE-2026-28877: Rosyna Keller of Totally Not Malicious Software

Audio
Available for: Apple Watch Series 6 and later
Impact: Processing maliciously crafted web content may lead to an
unexpected process crash
Description: A use-after-free issue was addressed with improved memory
management.
CVE-2026-28879: Justin Cohen of Google

Audio
Available for: Apple Watch Series 6 and later
Impact: An attacker may be able to cause unexpected app termination
Description: A type confusion issue was addressed with improved memory
handling.
CVE-2026-28822: Jex Amro

CoreMedia
Available for: Apple Watch Series 6 and later
Impact: Processing an audio stream in a maliciously crafted media file
may terminate the process
Description: An out-of-bounds access issue was addressed with improved
bounds checking.
CVE-2026-20690: Hossein Lotfi (@hosselot) of Trend Micro Zero Day
Initiative

CoreUtils
Available for: Apple Watch Series 6 and later
Impact: A user in a privileged network position may be able to cause a
denial-of-service
Description: A null pointer dereference was addressed with improved
input validation.
CVE-2026-28886: Etienne Charron (Renault) and Victoria Martini (Renault)

Crash Reporter
Available for: Apple Watch Series 6 and later
Impact: An app may be able to enumerate a user's installed apps
Description: A privacy issue was addressed by removing sensitive data.
CVE-2026-28878: Zhongcheng Li from IES Red Team

curl
Available for: Apple Watch Series 6 and later
Impact: An issue existed in curl which may result in unintentionally
sending sensitive information via an incorrect connection
Description: 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-2025-14524

GeoServices
Available for: Apple Watch Series 6 and later
Impact: An app may be able to access sensitive user data
Description: An information leakage was addressed with additional
validation.
CVE-2026-28870: XiguaSec

ImageIO
Available for: Apple Watch Series 6 and later
Impact: Processing a maliciously crafted file may lead to unexpected app
termination
Description: 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-2025-64505

Kernel
Available for: Apple Watch Series 6 and later
Impact: An app may be able to disclose kernel memory
Description: A logging issue was addressed with improved data redaction.
CVE-2026-28868: 이동하 (Lee Dong Ha of BoB 0xB6)

Kernel
Available for: Apple Watch Series 6 and later
Impact: An app may be able to leak sensitive kernel state
Description: This issue was addressed with improved authentication.
CVE-2026-28867: Jian Lee (@speedyfriend433)

Kernel
Available for: Apple Watch Series 6 and later
Impact: An app may be able to cause unexpected system termination or
corrupt kernel memory
Description: The issue was addressed with improved memory handling.
CVE-2026-20698: DARKNAVY (@DarkNavyOrg)

Kernel
Available for: Apple Watch Series 6 and later
Impact: An app may be able to cause unexpected system termination or
write kernel memory
Description: A use after free issue was addressed with improved memory
management.
CVE-2026-20687: Johnny Franks (@zeroxjf)

libxpc
Available for: Apple Watch Series 6 and later
Impact: An app may be able to enumerate a user's installed apps
Description: This issue was addressed with improved checks.
CVE-2026-28882: Ilias Morad (A2nkF) of Voynich Group, Duy Trần
(@khanhduytran0), @hugeBlack

Sandbox Profiles
Available for: Apple Watch Series 6 and later
Impact: An app may be able to fingerprint the user
Description: A permissions issue was addressed with additional
restrictions.
CVE-2026-28863: Gongyu Ma (@Mezone0)

Security
Available for: Apple Watch Series 6 and later
Impact: A local attacker may gain access to user's Keychain items
Description: This issue was addressed with improved permissions
checking.
CVE-2026-28864: Alex Radocea

Siri
Available for: Apple Watch Series 6 and later
Impact: An attacker with physical access to a locked device may be able
to view sensitive user information
Description: The issue was addressed with improved authentication.
CVE-2026-28856: an anonymous researcher

UIFoundation
Available for: Apple Watch Series 6 and later
Impact: An app may be able to cause a denial-of-service
Description: A stack overflow was addressed with improved input
validation.
CVE-2026-28852: Caspian Tarafdar

WebKit
Available for: Apple Watch Series 6 and later
Impact: Processing maliciously crafted web content may prevent Content
Security Policy from being enforced
Description: This issue was addressed through improved state management.
WebKit Bugzilla: 304951
CVE-2026-20665: webb

WebKit
Available for: Apple Watch Series 6 and later
Impact: A malicious website may be able to process restricted web
content outside the sandbox
Description: The issue was addressed with improved memory handling.
WebKit Bugzilla: 308248
CVE-2026-28859: greenbynox, Arni Hardarson

WebKit Sandboxing
Available for: Apple Watch Series 6 and later
Impact: A maliciously crafted webpage may be able to fingerprint the
user
Description: An authorization issue was addressed with improved state
management.
WebKit Bugzilla: 306827
CVE-2026-20691: Gongyu Ma (@Mezone0)

Additional recognition

AirPort
We would like to acknowledge Yashar Shahinzadeh, Saman Ebrahimnezhad,
Amir Safari, Omid Rezaii for their assistance.

Bluetooth
We would like to acknowledge Hamid Mahmoud for their assistance.

Captive Network
We would like to acknowledge Kun Peeks (@SwayZGl1tZyyy) for their
assistance.

CloudAttestation
We would like to acknowledge Suresh Sundaram, Willard Jansen for their
assistance.

CoreUI
We would like to acknowledge Peter Malone for their assistance.

Find My
We would like to acknowledge Salemdomain for their assistance.

GPU Drivers
We would like to acknowledge Jian Lee (@speedyfriend433) for their
assistance.

ICU
We would like to acknowledge Jian Lee (@speedyfriend433) for their
assistance.

Kernel
We would like to acknowledge DARKNAVY (@DarkNavyOrg), Kylian Boulard De
Pouqueville From Fuzzinglabs, Patrick Ventuzelo From Fuzzinglabs, Robert
Tran, Suresh Sundaram for their assistance.

libarchive
We would like to acknowledge Andreas Jaegersberger & Ro Achterberg of
Nosebeard Labs, Arni Hardarson for their assistance.

libc
We would like to acknowledge Vitaly Simonovich for their assistance.

Libnotify
We would like to acknowledge Ilias Morad (@A2nkF_) for their assistance.

LLVM
We would like to acknowledge Nathaniel Oh (@calysteon) for their
assistance.

Messages
We would like to acknowledge JZ for their assistance.

MobileInstallation
We would like to acknowledge Gongyu Ma (@Mezone0) for their assistance.

ppp
We would like to acknowledge Dave G. for their assistance.

Quick Look
We would like to acknowledge Wojciech Regula of SecuRing
(wojciechregula.blog), an anonymous researcher for their assistance.

Safari
We would like to acknowledge @RenwaX23, Farras Givari, Syarif Muhammad
Sajjad, Yair for their assistance.

Shortcuts
We would like to acknowledge Waleed Barakat (@WilDN00B) and Paul
Montgomery (@nullevent) for their assistance.

Siri
We would like to acknowledge Anand Mallaya, Tech consultant, Anand
Mallaya and Co., Harsh Kirdolia, Hrishikesh Parmar of Self-Employed for
their assistance.

Spotlight
We would like to acknowledge Bilge Kaan Mızrak, Claude & Friends: Risk
Analytics Research Group, Zack Tickman for their assistance.

Time Zone
We would like to acknowledge Abhay Kailasia (@abhay_kailasia) from
Safran Mumbai India for their assistance.

UIKit
We would like to acknowledge AEC, Abhay Kailasia (@abhay_kailasia) from
Safran Mumbai India, Bishal Kafle (@whoisbishal.k), Carlos Luna (U.S.
Department of the Navy), Dalibor Milanovic, Daren Goodchild, JS De
Mattei, Maxwell Garn, Zack Tickman, fuyuu12, incredincomp for their
assistance.

Wallet
We would like to acknowledge Zhongcheng Li from IES Red Team of
ByteDance for their assistance.

Web Extensions
We would like to acknowledge Carlos Jeurissen, Rob Wu (robwu.nl) for
their assistance.

WebKit
We would like to acknowledge Vamshi Paili for their assistance.

WebKit Process Model
We would like to acknowledge Joseph Semaan for their assistance.

Wi-Fi
We would like to acknowledge Kun Peeks (@SwayZGl1tZyyy), an anonymous
researcher for their assistance.

Wi-Fi Connectivity
We would like to acknowledge Alex Radocea of Supernetworks, Inc for
their assistance.

Widgets
We would like to acknowledge Marcel Voß, Mitul Pranjay, Serok Çelik for
their assistance.

Instructions on how to update your Apple Watch software are
available at https://support.apple.com/kb/HT204641

To check the version on your Apple Watch, open the Apple Watch app
on your iPhone and select "My Watch > General > About".

Alternatively, on your watch, select "My Watch > General > About".

All information is also posted on the Apple Security Releases
web site: https://support.apple.com/100100.

This message is signed with Apple's Product Security PGP key,
and details are available at:
https://www.apple.com/support/security/pgp/

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