CVE-2026-64763

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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 by removing the vulnerable code. 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. Processing a maliciously crafted file may lead to unexpected app termination or arbitrary code execution.

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-2026-64763

EUVD

EUVD-2026-49614

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 vulnerability is an out-of-bounds write issue that was fixed by removing the vulnerable code. Processing a maliciously crafted file could cause unexpected app termination or arbitrary code execution.

Detection Guidance

This vulnerability is addressed by updating to specific versions of Apple operating systems. Detection involves checking system versions against the patched releases: 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, watchOS 26.6. Use system update commands like 'softwareupdate --list' on macOS or check Settings > General > Software Update on iOS/iPadOS.

Impact Analysis

If exploited, this vulnerability could allow attackers to execute arbitrary code on your device or cause apps to crash unexpectedly. This could lead to data loss, unauthorized access, or other malicious activities depending on the app affected.

Compliance Impact

The vulnerability involves an out-of-bounds write issue that could allow arbitrary code execution or app termination when processing maliciously crafted files. This could potentially lead to unauthorized data access or manipulation, which may impact compliance with standards like GDPR (data protection) or HIPAA (health data privacy). However, the provided CVE details do not specify direct compliance implications or affected systems.

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.

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