Out-of-Bounds Write in Apple macOS and iOS

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apple Inc.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Mounting a disk image with maliciously crafted files may lead to unexpected system termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-14

Last Modified

2026-09-14

Generated

2026-09-15

AI Q&A

2026-09-15

EPSS Evaluated

N/A

NVD

CVE-2026-84519

Affected Vendors & Products

Vendor	Product	Version / Range
apple	ios	26.7
apple	ipados	26.7
apple	ios	27
apple	ipados	27
apple	macos_golden_gate	27
apple	macos_sequoia	15.8
apple	macos_tahoe	26.7

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 when processing disk images. Mounting a maliciously crafted disk image could trigger unexpected system termination due to memory corruption.

Impact Analysis

If exploited, this flaw could cause your device to crash unexpectedly when opening a specially crafted disk image. It does not appear to allow arbitrary code execution or data theft based on the provided information.

Mitigation Strategies

Update affected Apple devices to the latest versions: iOS 26.7 or later, iPadOS 26.7 or later, iOS 27 or later, iPadOS 27 or later, macOS Golden Gate 27, macOS Sequoia 15.8, or macOS Tahoe 26.7. Avoid mounting untrusted disk images until updates are applied.

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