---
id: CVE-2026-84543
title: An out-of-bounds access issue was addressed with improved bounds checking
summary: >-
  An out-of-bounds access issue was addressed with improved bounds checking.
  This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe
  26.7. Connecting to a malicious SMB server may cause unexpected system
  termination or…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-125
vendor: apple
product: macos
affected:
  - 'macos >= 15.0, < 15.8'
  - 'macos >= 26.0, < 26.7'
patched:
  - macos 26.7
published: '2026-09-14'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T14:47:51.130'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84543'
references:
  - url: 'https://support.apple.com/en-us/149035'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149042'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149043'
    label: product-security@apple.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00428
epssPercentile: 0.3447
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T18:12:24.680753Z'
ingestedAt: '2026-09-14T21:15:17.470Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/petermalone/CVE-2026-84543'
  checkedAt: '2026-09-26T09:06:02.680Z'
exploitAvailable: true
---

## Overview

An out-of-bounds access issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may cause unexpected system termination or corrupt kernel memory.

## Affected

- `macos >= 15.0, < 15.8`
- `macos >= 26.0, < 26.7`

## Remediation

Upgrade past the affected range:

- `macos 26.7`