---
id: CVE-2026-86900
title: An out-of-bounds read issue was addressed with improved input validation
summary: >-
  An out-of-bounds read issue was addressed with improved input validation. 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: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
vendor: apple
product: macos
affected:
  - macos < 27.0
patched:
  - macos 27.0
published: '2026-09-14'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T15:08:46.783'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86900'
references:
  - url: 'https://support.apple.com/en-us/149035'
    label: product-security@apple.com
tags:
  - nvd
  - cve.org
epss: 0.00343
epssPercentile: 0.25115
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-17T15:37:07.148842Z'
ingestedAt: '2026-09-14T21:15:17.536Z'
---

## Overview

An out-of-bounds read issue was addressed with improved input validation. 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`