CVE-2026-43816

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Out-of-Bounds Write in Apple iOS and macOS

Publication date: 2026-07-27

Last updated on: 2026-07-29

Assigner: Apple Inc.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to cause unexpected system termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-27

Last Modified

2026-07-29

Generated

2026-08-17

AI Q&A

2026-07-28

EPSS Evaluated

2026-08-15

NVD

CVE-2026-43816

EUVD

EUVD-2026-49502

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	From 26.0 (inc) to 26.6 (exc)
apple	ipados	to 26.6 (exc)
apple	iphone_os	to 26.6 (exc)
apple	tvos	to 26.6 (exc)
apple	visionos	to 26.6 (exc)
apple	watchos	to 26.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-787	The product writes data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds write vulnerability caused by insufficient bounds checking. It allows an application to write data outside the intended memory buffer, potentially corrupting adjacent memory. Apple patched it in iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, and watchOS 26.6.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires checking the installed version against the patched releases. No direct detection commands are provided in the context.

Impact Analysis

An attacker could exploit this to cause an app to crash or trigger unexpected system termination. This may lead to denial-of-service conditions or potential data corruption if exploited maliciously.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The issue involves an out-of-bounds write that may cause unexpected system termination, but no direct implications for regulatory compliance are mentioned.

Mitigation Strategies

Update affected Apple devices to the latest versions: iOS 26.6, iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, or watchOS 26.6 to address the out-of-bounds write issue.

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