CVE-2026-43773

Received Received - Intake

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

Publication date: 2026-07-27

Last updated on: 2026-07-27

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

Probability:
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Meta Information

Published

2026-07-27

Last Modified

2026-07-27

Generated

2026-07-28

AI Q&A

2026-07-28

EPSS Evaluated

N/A

NVD

CVE-2026-43773

EUVD

EUVD-2026-49535

Affected Vendors & Products

Vendor	Product	Version / Range
apple	macos_sequoia	15.7.8
apple	macos_sonoma	14.8.8
apple	macos_tahoe	26.6

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

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.

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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