iOS 26.4 Security Update

What iOS 26.4 Fixes

iOS 26.4 and iPadOS 26.4, released March 24, 2026, fixes 44 vulnerabilities in 30 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 iOS 26.4 a routine security update: worth installing soon, not an emergency.

It has since been superseded: the newest security release for iOS 26 is iOS 26.7.2 and iPadOS 26.7.2, from October 26, 2026, which includes these fixes.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 iOS 26.4

Apple lists iOS 26.4 and iPadOS 26.4 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.

How to Install iOS 26.4

On the iPhone, open Settings → General → Software Update. If more than one update is offered, the one with the higher version number is the current release; the other is for people who want to stay on the previous major version.

Security fixes are cumulative: any later release for the same version includes these as well, so if you are already past iOS 26.4 there is nothing to do.

Every Fix in iOS 26.4

All 44 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.

• 802.1X

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

  An authentication issue was addressed with improved state management.

  CVE-2026-28865

• CoreUtils

  A user in a privileged network position may be able to cause a denial-of-service

  A null pointer dereference was addressed with improved input validation.

  CVE-2026-28886

• Kernel

  An app may be able to disclose kernel memory

  A logging issue was addressed with improved data redaction.

  CVE-2026-28868

• Kernel

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

  The issue was addressed with improved memory handling.

  CVE-2026-20698

• 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-2026-20687

• ppp

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

  The issue was addressed with improved memory handling.

  CVE-2026-28896

• Printing

  An app may be able to break out of its sandbox

  A path handling issue was addressed with improved validation.

  CVE-2026-20688

• Telephony

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

  A buffer overflow was addressed with improved bounds checking.

  CVE-2026-28858

• Telephony

  An attacker in a privileged network position may be able to cause a denial-of-service

  A denial-of-service issue was addressed with improved input validation.

  CVE-2026-28967

• WebKit

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

  The issue was addressed with improved memory handling.

  CVE-2026-28859

• Accounts

  An app may be able to access sensitive user data

  An authorization issue was addressed with improved state management.

  CVE-2026-28877

• Clipboard

  An app may be able to access sensitive user data

  This issue was addressed with improved validation of symlinks.

  CVE-2026-28866

• curl

  An issue existed in curl which may result in unintentionally sending sensitive information via an incorrect connection

  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

• DeviceLink

  An app may be able to access sensitive user data

  A parsing issue in the handling of directory paths was addressed with improved path validation.

  CVE-2026-28876

• GeoServices

  An app may be able to access sensitive user data

  An information leakage was addressed with additional validation.

  CVE-2026-28870

• Kernel

  An app may be able to leak sensitive kernel state

  This issue was addressed with improved authentication.

  CVE-2026-28867

• Privacy

  An app may be able to circumvent App Privacy Report logging

  This issue was addressed with additional entitlement checks.

  CVE-2026-28873

• Security

  A local attacker may gain access to user's Keychain items

  This issue was addressed with improved permissions checking.

  CVE-2026-28864

• Security

  A local attacker may be able to modify the state of the Keychain

  The issue was addressed with improved input validation.

  CVE-2026-28860

• Siri

  An attacker with physical access to a locked device may be able to view sensitive user information

  The issue was addressed with improved authentication.

  CVE-2026-28856

• WebKit

  Processing maliciously crafted web content may bypass Same Origin Policy

  A cross-origin issue in the Navigation API was addressed with improved input validation.

  CVE-2026-20643

• WebKit

  Visiting a maliciously crafted website may lead to a cross-site scripting attack

  A logic issue was addressed with improved checks.

  CVE-2026-28871

• Audio

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

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

  CVE-2026-28879

• Audio

  An attacker may be able to cause unexpected app termination

  A type confusion issue was addressed with improved memory handling.

  CVE-2026-28822

• Baseband

  A remote attacker may cause an unexpected app termination

  The issue was addressed with improved checks.

  CVE-2026-28874

• Baseband

  A remote attacker may be able to cause a denial-of-service

  A buffer overflow was addressed with improved bounds checking.

  CVE-2026-28875

• Calendar

  A remote attacker may be able to cause a denial-of-service

  A resource exhaustion issue was addressed with improved input validation.

  CVE-2026-28872

• Calling Framework

  A remote attacker may be able to cause a denial-of-service

  A denial-of-service issue was addressed with improved input validation.

  CVE-2026-28894

• ImageIO

  Processing a maliciously crafted file may lead to unexpected app termination

  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

• UIFoundation

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

  A stack overflow was addressed with improved input validation.

  CVE-2026-28852

• Vision

  Parsing a maliciously crafted file may lead to an unexpected app termination

  A buffer overflow issue was addressed with improved memory handling.

  CVE-2026-20657

• WebKit

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

  The issue was addressed with improved memory handling.

  CVE-2026-20664 CVE-2026-28857

• App Protection

  An attacker with physical access to an iOS device with Stolen Device Protection enabled may be able to access biometrics-gated Protected Apps with the passcode

  The issue was addressed with improved checks.

  CVE-2026-28895

• CoreMedia

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

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

  CVE-2026-20690

• Crash Reporter

  An app may be able to enumerate a user's installed apps

  A privacy issue was addressed by removing sensitive data.

  CVE-2026-28878

• iCloud

  An app may be able to enumerate a user's installed apps

  A permissions issue was addressed with additional restrictions.

  CVE-2026-28880 CVE-2026-28833

• libxpc

  An app may be able to enumerate a user's installed apps

  This issue was addressed with improved checks.

  CVE-2026-28882

• Mail

  "Hide IP Address" and "Block All Remote Content" may not apply to all mail content

  A privacy issue was addressed with improved handling of user preferences.

  CVE-2026-20692

• Sandbox Profiles

  An app may be able to fingerprint the user

  A permissions issue was addressed with additional restrictions.

  CVE-2026-28863

• WebKit

  Processing maliciously crafted web content may prevent Content Security Policy from being enforced

  This issue was addressed through improved state management.

  CVE-2026-20665

• WebKit

  A malicious website may be able to access script message handlers intended for other origins

  A logic issue was addressed with improved state management.

  CVE-2026-28861

• WebKit Sandboxing

  A maliciously crafted webpage may be able to fingerprint the user

  An authorization issue was addressed with improved state management.

  CVE-2026-20691

iOS 26 Security Release History

iOS 26.4 in context: the security releases Apple has published for iOS 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