CVE-2026-64739

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. An attacker may be able to cause unexpected app termination.

CVSS Scores

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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-2026-64739

EUVD

EUVD-2026-49472

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. It allows an attacker to write data outside the intended memory area, potentially leading to unexpected app termination or other unintended behavior.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires checking installed versions against patched releases. 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 for Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6. No direct commands detect the vulnerability itself, only version compliance.

Impact Analysis

An attacker could exploit this to cause apps to crash or behave unpredictably. This may disrupt device functionality or lead to data loss if critical apps are affected.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The issue involves an out-of-bounds write that could cause unexpected app termination, but no direct impact on data protection or privacy compliance is mentioned.

Mitigation Strategies

Update all Apple devices to the latest versions: iOS/iPadOS 26.6, macOS Sequoia 15.7.8, Sonoma 14.8.8, Tahoe 26.6, tvOS 26.6, visionOS 26.6, or watchOS 26.6. Enable automatic updates to prevent future issues. Remove unused Apple devices from the network until updated.

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