Out-of-Bounds Write in Apple iOS and macOS

Publication date: 2026-05-11

Last updated on: 2026-05-11

Assigner: Apple Inc.

Description

An out-of-bounds write issue was addressed with improved input validation. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, macOS Tahoe 26.5. Parsing a maliciously crafted file may lead to an unexpected app termination.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-05-11

Last Modified

2026-05-11

Generated

2026-07-11

AI Q&A

2026-05-12

EPSS Evaluated

2026-07-10

NVD

CVE-2026-43656

Affected Vendors & Products

Vendor	Product	Version / Range
apple	ios	18.7.9
apple	ipados	18.7.9
apple	ios	26.5
apple	ipados	26.5
apple	macos_sequoia	15.7.7
apple	macos_sonoma	14.8.7
apple	macos_tahoe	26.5

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds write issue that occurs due to insufficient input validation when parsing files. A specially crafted malicious file can trigger this flaw, potentially causing an application to terminate unexpectedly.

Impact Analysis

The primary impact of this vulnerability is that parsing a maliciously crafted file may cause an application to crash unexpectedly. This could lead to denial of service or disruption of normal application functionality.

Mitigation Strategies

To mitigate this vulnerability, update your Apple devices to the fixed versions: iOS 18.7.9, iPadOS 18.7.9, iOS 26.5, iPadOS 26.5, macOS Sequoia 15.7.7, macOS Sonoma 14.8.7, or macOS Tahoe 26.5.

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