CVE-2026-43773

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in macOS with Malicious Disk Image

Publication date: 2026-07-27

Last updated on: 2026-07-28

Assigner: Apple Inc.

Description

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Mounting a maliciously crafted disk image may cause unexpected system termination or corrupt kernel memory.

CVSS Scores

EPSS 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

2026-08-16

NVD

CVE-2026-43773

EUVD

EUVD-2026-49535

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)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This is an out-of-bounds read vulnerability caused by insufficient bounds checking. When a maliciously crafted disk image is mounted, it may trigger unexpected system termination or corrupt kernel memory by accessing data outside intended memory areas.

Detection Guidance

This vulnerability is specific to macOS systems and relates to disk image handling. Detection primarily involves checking your macOS version against the patched versions listed in the CVE description. Use the command 'sw_vers' to check your macOS version.

Impact Analysis

Mounting a malicious disk image could crash your system or corrupt critical kernel memory, potentially leading to data loss or unauthorized access. This requires user interaction to trigger by opening a specially crafted file.

Compliance Impact

This vulnerability may lead to kernel memory corruption or system termination when mounting malicious disk images. Such instability could compromise data integrity and availability, potentially violating GDPR's integrity and confidentiality principles or HIPAA's security requirements for protected health information.

Mitigation Strategies

Immediately update your macOS to the latest patched version: macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, or macOS Tahoe 26.6. Avoid mounting untrusted disk images until the update is applied.

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