CVE-2026-84523

Received Received - Intake

Out-of-Bounds Write in Apple iOS and macOS

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, tvOS 27, visionOS 27, watchOS 27. An app may be able to cause unexpected system termination or write kernel memory.

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-2026-84523

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
apple	tvos	27
apple	visionos	27
apple	watchos	27

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. An app could exploit this to write data outside intended memory areas, potentially causing system crashes or corrupting kernel memory.

Detection Guidance

This vulnerability is specific to Apple operating systems and requires checking for outdated versions. For iOS/iPadOS, go to Settings > General > About and verify the version is 26.7 or later. For macOS, check System Settings > General > About and confirm the version is 15.8 or later. No direct commands are provided for detection.

Impact Analysis

An attacker could exploit this to crash your device or gain unauthorized access to kernel memory, leading to system instability or potential data breaches. It primarily affects Apple devices running specific OS versions.

Mitigation Strategies

Update affected Apple devices to the latest versions: iOS 26.7 or later, iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, tvOS 27, visionOS 27, or watchOS 27. Disable automatic app installations from untrusted sources until updates are applied.

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