CVE-2026-43817

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Out-of-Bounds Read in Apple iOS and macOS

Publication date: 2026-07-27

Last updated on: 2026-07-29

Assigner: Apple Inc.

Description

An out-of-bounds read 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:
Percentile:

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-2026-43817

EUVD

EUVD-2026-49523

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-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability caused by insufficient bounds checking. It allows an application to read memory outside the intended buffer, which could lead to unexpected system termination or other unintended behavior.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires checking system versions. Detection involves verifying if your device is running an affected version of iOS, iPadOS, macOS Tahoe, tvOS, visionOS, or watchOS. No direct commands detect the vulnerability itself, but you can check system versions to confirm if updates are needed.

Impact Analysis

An attacker could exploit this to cause an app to crash or trigger unexpected system behavior. However, the impact is limited since it only affects specific Apple operating systems and requires an attacker to have access to run malicious code on the device.

Compliance Impact

The provided CVE data does not specify any direct impact on compliance with standards like GDPR or HIPAA. The vulnerability is an out-of-bounds read issue causing unexpected system termination, which may affect data availability but lacks details on data exposure or privacy implications.

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 read vulnerability.

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