---
id: CVE-2026-86901
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 Golden Gate 27. Mounting a maliciously crafted exFAT
  volume may cause unexpected system termination or kernel memory disclosure.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-787
vendor: apple
product: macos
affected:
  - macos < 27.0
patched:
  - macos 27.0
published: '2026-09-14'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T16:35:15.753'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86901'
references:
  - url: 'https://support.apple.com/en-us/149035'
    label: product-security@apple.com
tags:
  - nvd
  - cve.org
epss: 0.00124
epssPercentile: 0.02449
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T16:13:16.711448Z'
ingestedAt: '2026-09-14T21:15:17.514Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27. Mounting a maliciously crafted exFAT volume may cause unexpected system termination or kernel memory disclosure.

## Affected

- `macos < 27.0`

## Remediation

Upgrade past the affected range:

- `macos 27.0`