CVE-2026-43666
Received Received - Intake
Out-of-Bounds Write in Apple iOS, iPadOS, macOS, tvOS, visionOS, and watchOS

Publication date: 2026-05-11

Last updated on: 2026-05-11

Assigner: Apple Inc.

Description
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. An attacker on the local network may be able to cause a denial-of-service.
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Meta Information
Published
2026-05-11
Last Modified
2026-05-11
Generated
2026-06-21
AI Q&A
2026-05-12
EPSS Evaluated
2026-06-20
NVD
CVE-2026-43666
Affected Vendors & Products
Showing 10 associated CPEs
Vendor Product Version / Range
apple ios 18.7.9
apple ipados 18.7.9
apple ios 26.5
apple ipados 26.5
apple macos_sequoia 15.7.7
apple macos_sonoma 14.8.7
apple macos_tahoe 26.5
apple tvos 26.5
apple visionos 26.5
apple watchos 26.5
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Impact Analysis

An attacker on the local network may be able to exploit this vulnerability to cause a denial-of-service (DoS) condition.

This means that the affected device or system could become unresponsive or crash, disrupting normal operations.

Executive Summary

This vulnerability is an out-of-bounds write issue that was addressed by improving bounds checking in affected Apple operating systems.

An out-of-bounds write occurs when a program writes data outside the boundaries of allocated memory, which can lead to unexpected behavior or crashes.

In this case, the issue could be exploited by an attacker on the local network.

Mitigation Strategies

To mitigate this vulnerability, update your Apple devices to the fixed versions of the operating systems as soon as possible.

  • Update iOS and iPadOS devices to versions 18.7.9 or 26.5.
  • Update macOS Sequoia to 15.7.7, macOS Sonoma to 14.8.7, and macOS Tahoe to 26.5.
  • Update tvOS, visionOS, and watchOS devices to version 26.5.

These updates include improved bounds checking that address the out-of-bounds write issue and prevent potential denial-of-service attacks from local network attackers.

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