CVE-2026-43739

Received Received - Intake

Out-of-Bounds Write in Apple iOS and macOS

Publication date: 2026-07-27

Last updated on: 2026-07-27

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

2026-07-27

Generated

2026-07-28

AI Q&A

2026-07-28

EPSS Evaluated

N/A

NVD

CVE-2026-43739

EUVD

EUVD-2026-49612

Affected Vendors & Products

Vendor	Product	Version / Range
apple	ios	26.6
apple	ipad_os	26.6
apple	macos_tahoe	26.6
apple	tv_os	26.6
apple	vision_os	26.6
apple	watch_os	26.6

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is an out-of-bounds write vulnerability caused by insufficient bounds checking. It allows an app to write data outside the intended memory area, potentially leading to system instability or crashes.

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. Verify system versions using built-in update tools or system information commands like 'sw_vers' on macOS or 'Settings > General > About' on iOS/iPadOS.

Impact Analysis

An attacker could exploit this to cause unexpected system termination on affected devices. This may result in data loss or denial of service for the user.

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. Enable automatic updates if available to prevent future vulnerabilities.

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