---
id: CVE-2026-43761
title: An out-of-bounds write issue was addressed with improved bounds checking
summary: >-
  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.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-787
vendor: apple
product: macos
affected:
  - 'macos >= 14.0, < 14.8.8'
  - 'macos >= 15.0, < 15.7.8'
  - 'macos >= 26.0, < 26.6'
patched:
  - macos 26.6
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T19:23:08.817'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-43761'
references:
  - url: 'https://support.apple.com/en-us/128067'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/128071'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/128072'
    label: product-security@apple.com
tags:
  - nvd
  - cve.org
epss: 0.00404
epssPercentile: 0.31897
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T14:34:14.849776Z'
ingestedAt: '2026-09-14T21:15:17.472Z'
---

## Overview

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.

## Affected

- `macos >= 14.0, < 14.8.8`
- `macos >= 15.0, < 15.7.8`
- `macos >= 26.0, < 26.6`

## Remediation

Upgrade past the affected range:

- `macos 26.6`