iPhone向けのiOSやiPad向けのiPadOSの最新メジャーバージョンとして先ごろよりiOS 26.0とiPadOS 26.0が提供開始されていましたが、これらに続けて新機能が追加されたiOS 26.1とiPadOS 26.1、iOS 26.2とiPadOS 26.2が提供されてきましたが、今回、AirTag（第2世代）に対応したiOS 26.2.1とiPadOS 26.2.1の不具合や脆弱性を修正したiOS 26.3およびiPadOS 26.3がリリースされました。iOS 26.3およびiPadOS 26.3の対象機種は以下の通り。

＜iOS 26対応製品＞
・iPhone 17
・iPhone 17 Pro
・iPhone 17 Pro Max
・iPhone Air
・iPhone 16e
・iPhone 16
・iPhone 16 Plus
・iPhone 16 Pro
・iPhone 16 Pro Max
・iPhone 15
・iPhone 15 Plus
・iPhone 15 Pro
・iPhone 15 Pro Max
・iPhone 14
・iPhone 14 Plus
・iPhone 14 Pro
・iPhone 14 Pro Max
・iPhone 13
・iPhone 13 mini
・iPhone 13 Pro
・iPhone 13 Pro Max
・iPhone 12
・iPhone 12 mini
・iPhone 12 Pro
・iPhone 12 Pro Max
・iPhone 11
・iPhone 11 Pro
・iPhone 11 Pro Max
・iPhone SE（第3世代）
・iPhone SE（第2世代）

＜iPadOS 26対応製品＞
・iPad（第8世代）
・iPad（第9世代）
・iPad（第10世代）
・iPad（A16）
・iPad mini（第5世代）
・iPad mini（第6世代）
・iPad mini（A17 Pro）
・iPad Air（第3世代）
・iPad Air（第4世代）
・iPad Air（第5世代）
・11インチiPad Air（M2）
・11インチiPad Air（M3）
・13インチiPad Air（M2）
・13インチiPad Air（M3）
・11インチiPad Pro（第1世代）
・11インチiPad Pro（第2世代）
・11インチiPad Pro（第3世代）
・11インチiPad Pro（第4世代）
・11インチiPad Pro（M4）
・11インチiPad Pro（M5）
・12.9インチiPad Pro（第3世代）
・12.9インチiPad Pro（第4世代）
・12.9インチiPad Pro（第5世代）
・12.9インチiPad Pro（第6世代）
・13インチiPad Pro（M4）
・13インチiPad Pro（M5）

更新は従来通り各製品本体のみでOTA（On-The-Air）によりダウンロードで行え、方法としては、「設定」→「一般」→「ソフトウェア・アップデート」から行え、単体でアップデートする場合のダウンロードサイズは手持ちのiPhone 15 Pro MaxでiOS 26.2からだと13.09GBとなっています。またiTunesをインストールしたWindowsおよびMacとUSB-Lightningケーブルで接続しても実施できます。なお、Appleが案内しているアップデートの内容およびセキュリティーコンテンツの修正は以下の通り。

iOS 26.3
このアップデートには、重要なバグ修正とセキュリティアップデートが含まれます。

Appleソフトウェアアップデートのセキュリティコンテンツについては、以下をご覧ください: https://support.apple.com/100100

一部の機能は、地域によっては使用できない場合があります。詳しくは、以下のWebサイトをご覧ください: https://www.apple.com/jp/os/ios

今回のアップデートのように、ソフトウェアアップデートでは、新機能やさまざまな改善が追加される一方で、パフォーマンスやバッテリー駆動時間に影響する場合があります。詳しくは以下のWebサイトをご覧ください: https://support.apple.com/125039

iPadOS 26.3
このアップデートには、重要なバグ修正とセキュリティアップデートが含まれます。

Appleソフトウェアアップデートのセキュリティコンテンツについては、以下をご覧ください: https://support.apple.com/100100

一部の機能は、地域によっては使用できない場合があります。詳しくは、以下のWebサイトをご覧ください: https://www.apple.com/jp/os/ipados/

今回のアップデートのように、ソフトウェアアップデートでは、新機能やさまざまな改善が追加される一方で、パフォーマンスやバッテリー駆動時間に影響する場合があります。詳しくは以下のWebサイトをご覧ください: https://support.apple.com/125039

iOS 26.3 and iPadOS 26.3
Released February 11, 2026

- Accessibility
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with physical access to a locked device may be able to view sensitive user information
Description: An inconsistent user interface issue was addressed with improved state management.
CVE-2026-20645: Loh Boon Keat

- Accessibility
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with physical access to a locked device may be able to view sensitive user information
Description: A privacy issue was addressed by removing sensitive data.
CVE-2026-20674: Jacob Prezant (prezant.us)

- Bluetooth
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker in a privileged network position may be able to perform denial-of-service attack using crafted Bluetooth packets
Description: A denial-of-service issue was addressed with improved validation.
CVE-2026-20650: jioundai

- Call History
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A user with Live Caller ID app extensions turned off could have identifying information leaked to the extensions
Description: A logic issue was addressed with improved checks.
CVE-2026-20638: Nils Hanff (@nils1729@chaos.social) of Hasso Plattner Institute

- CFNetwork
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A remote user may be able to write arbitrary files
Description: A path handling issue was addressed with improved logic.
CVE-2026-20660: Amy (amys.website)

- CoreAudio
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing a maliciously crafted media file may lead to unexpected app termination or corrupt process memory
Description: An out-of-bounds access issue was addressed with improved bounds checking.
CVE-2026-20611: Anonymous working with Trend Micro Zero Day Initiative

- CoreMedia
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing a maliciously crafted file may lead to a denial-of-service or potentially disclose memory contents
Description: The issue was addressed with improved memory handling.
CVE-2026-20609: Yiğit Can YILMAZ (@yilmazcanyigit)

- CoreServices
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to gain root privileges
Description: A race condition was addressed with improved state handling.
CVE-2026-20617: Gergely Kalman (@gergely_kalman), Csaba Fitzl (@theevilbit) of Iru

- CoreServices
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to gain root privileges
Description: A path handling issue was addressed with improved validation.
CVE-2026-20615: Csaba Fitzl (@theevilbit) of Iru and Gergely Kalman (@gergely_kalman)

- CoreServices
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to access sensitive user data
Description: An issue existed in the handling of environment variables. This issue was addressed with improved validation.
CVE-2026-20627: an anonymous researcher

- dyld
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.
Description: A memory corruption issue was addressed with improved state management.
CVE-2026-20700: Google Threat Analysis Group

- Game Center
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A user may be able to view sensitive user information
Description: A logging issue was addressed with improved data redaction.
CVE-2026-20649: Asaf Cohen

- ImageIO
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing a maliciously crafted image may lead to disclosure of user information
Description: The issue was addressed with improved bounds checks.
CVE-2026-20675: George Karchemsky (@gkarchemsky) working with Trend Micro Zero Day Initiative

- ImageIO
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing a maliciously crafted image may result in disclosure of process memory
Description: The issue was addressed with improved memory handling.
CVE-2026-20634: George Karchemsky (@gkarchemsky) working with Trend Micro Zero Day Initiative

- Kernel
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to cause unexpected system termination
Description: The issue was addressed with improved memory handling.
CVE-2026-20654: Jian Lee (@speedyfriend433)

- Kernel
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A malicious app may be able to gain root privileges
Description: This issue was addressed with improved checks.
CVE-2026-20626: Keisuke Hosoda

- Kernel
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker in a privileged network position may be able to intercept network traffic
Description: A logic issue was addressed with improved checks.
CVE-2026-20671: Xin'an Zhou, Juefei Pu, Zhutian Liu, Zhiyun Qian, Zhaowei Tan, Srikanth V. Krishnamurthy, Mathy Vanhoef

- LaunchServices
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to enumerate a user's installed apps
Description: The issue was resolved by sanitizing logging.
CVE-2026-20663: Zhongcheng Li from IES Red Team

- libexpat
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing a maliciously crafted file may lead to a denial-of-service
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-2025-59375

- libxpc
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to break out of its sandbox
Description: A logic issue was addressed with improved checks.
CVE-2026-20667: an anonymous researcher

- Live Captions
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with physical access to a locked device may be able to view sensitive user information
Description: An authorization issue was addressed with improved state management.
CVE-2026-20655: Richard Hyunho Im (@richeeta) at Route Zero Security (routezero.security)

- Messages
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A shortcut may be able to bypass sandbox restrictions
Description: A race condition was addressed with improved handling of symbolic links.
CVE-2026-20677: Ron Masas of BreakPoint.SH

- Photos
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A person with physical access to an iOS device may be able to access photos from the lock screen
Description: An input validation issue was addressed.
CVE-2026-20642: Dalibor Milanovic

- Sandbox
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to break out of its sandbox
Description: A permissions issue was addressed with additional restrictions.
CVE-2026-20628: Noah Gregory (wts.dev)

- Sandbox Profiles
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to access sensitive user data
Description: An authorization issue was addressed with improved state management.
CVE-2026-20678: Óscar García Pérez, Stanislav Jelezoglo

- Screenshots
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker may be able to discover a user’s deleted notes
Description: A logic issue was addressed with improved state management.
CVE-2026-20682: Viktor Lord Härringtón

- Shortcuts
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to access sensitive user data
Description: A parsing issue in the handling of directory paths was addressed with improved path validation.
CVE-2026-20653: Enis Maholli (enismaholli.com)

- Spotlight
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A sandboxed app may be able to access sensitive user data
Description: The issue was addressed with additional restrictions on the observability of app states.
CVE-2026-20680: an anonymous researcher

- StoreKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to identify what other apps a user has installed
Description: A privacy issue was addressed with improved checks.
CVE-2026-20641: Gongyu Ma (@Mezone0)

- UIKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An app may be able to bypass certain Privacy preferences
Description: This issue was addressed by removing the vulnerable code.
CVE-2026-20606: LeminLimez

- UIKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with physical access to iPhone may be able to take and view screenshots of sensitive data from the iPhone during iPhone Mirroring with Mac
Description: An inconsistent user interface issue was addressed with improved state management.
CVE-2026-20640: Jacob Prezant (prezant.us)

- VoiceOver
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: An attacker with physical access to a locked device may be able to view sensitive user information
Description: An authorization issue was addressed with improved state management.
CVE-2026-20661: Dalibor Milanovic

- WebKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A remote attacker may be able to cause a denial-of-service
Description: The issue was addressed with improved memory handling.
WebKit Bugzilla: 303959
CVE-2026-20652: Nathaniel Oh (@calysteon)

- WebKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing maliciously crafted web content may lead to an unexpected process crash
Description: This issue was addressed through improved state management.
WebKit Bugzilla: 303357
CVE-2026-20608: HanQing from TSDubhe and Nan Wang (@eternalsakura13)

- WebKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: A website may be able to track users through Safari web extensions
Description: This issue was addressed through improved state management.
WebKit Bugzilla: 305020
CVE-2026-20676: Tom Van Goethem

- WebKit
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation and later
Impact: Processing maliciously crafted web content may lead to an unexpected process crash
Description: The issue was addressed with improved memory handling.
WebKit Bugzilla: 303444
CVE-2026-20644: HanQing from TSDubhe and Nan Wang (@eternalsakura13)
WebKit Bugzilla: 304657
CVE-2026-20636: EntryHi
WebKit Bugzilla: 304661
CVE-2026-20635: EntryHi

- Wi-Fi
Available for: iPhone 11 and later, iPad Pro 12.9-inch 3rd generation and later, iPad Pro 11-inch 1st generation and later, iPad Air 3rd generation and later, iPad 8th generation and later, and iPad mini 5th generation 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-2026-20621: Wang Yu of Cyberserval

■関連リンク
・エスマックス（S-MAX）
・エスマックス（S-MAX） smaxjp on Twitter
・S-MAX - Facebookページ
・iOS 26 関連記事一覧 - S-MAX
・iPadOS 26 関連記事一覧 - S-MAX
・iOS 26 のアップデートについて - Apple サポート (日本)
・iPadOS 26 のアップデートについて - Apple サポート (日本)
・iOS 26.3およびiPadOS 26.3のセキュリティコンテンツについて - Apple サポート (日本)
・Apple セキュリティアップデート - Apple サポート