CVE-2026-43761

Received Received - Intake

Out-of-Bounds Write in macOS Disk Image Handling

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 macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. Mounting a malicious disk image may cause 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-2026-43761

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 write vulnerability caused by insufficient bounds checking. When a malicious disk image is mounted, it may trigger unexpected system termination due to memory corruption.

Detection Guidance

This vulnerability is specific to macOS systems and relates to mounting malicious disk images. Detection primarily involves checking the macOS version and monitoring for unexpected system crashes when mounting disk images. Use the command 'sw_vers' to check your macOS version. If you are running a version older than Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6, your system is vulnerable.

Impact Analysis

Mounting a specially crafted disk image could cause your system to crash or become unstable. This may lead to data loss or denial of service on affected macOS systems.

Mitigation Strategies

Immediately update your macOS to the latest patched version: Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6. Avoid mounting disk images from untrusted sources until the update is applied. Regularly check for and install macOS updates to prevent similar issues.

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