CVE-2026-43803

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Write in Apple iOS and macOS

Publication date: 2026-07-27

Last updated on: 2026-07-28

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 Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. A remote attacker may be able to cause unexpected system termination.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-07-27

Last Modified

2026-07-28

Generated

2026-08-17

AI Q&A

2026-07-28

EPSS Evaluated

2026-08-15

NVD

CVE-2026-43803

EUVD

EUVD-2026-49562

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos	From 14.0 (inc) to 14.8.8 (exc)
apple	macos	From 15.0 (inc) to 15.7.8 (exc)
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. A remote attacker could exploit it to write data outside intended memory areas, potentially leading to system crashes or unexpected termination.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires updating to patched versions. Detection involves checking system version numbers rather than running commands to identify active exploitation. For iOS/iPadOS, go to Settings > General > About and verify version is 26.6 or later. For macOS, click Apple menu > About This Mac and check version against 15.7.8 (Sequoia), 14.8.8 (Sonoma), or 26.6 (Tahoe). Other Apple devices should show version 26.6 or higher in their settings.

Impact Analysis

If exploited, this vulnerability may allow a remote attacker to crash your device unexpectedly. It could disrupt normal operations but does not appear to enable data theft or persistent compromise based on the provided details.

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 could cause system termination, but no details are given about data exposure or privacy implications.

Mitigation Strategies

Update affected Apple devices to the latest versions: iOS 26.6, iPadOS 26.6, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, or watchOS 26.6 to address the out-of-bounds write issue.

Hi! I’m here to help you understand CVE-2026-43803. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70