---
id: CVE-2026-86929
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, macOS Sequoia 15.8.2, macOS Tahoe
  26.7.2. Processing a maliciously crafted file may lead to arbitrary code
  execution.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: adp
vendor: Apple
product: macOS
affected:
  - macOS < 15.8.2
  - macOS < 26.7.2
  - macOS < 27
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-26T00:00:00+00:00'
published: '2026-10-26'
updated: '2026-10-27'
sourceUpdated: '2026-10-27T03:56:16.360Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-86929'
references:
  - url: 'https://support.apple.com/en-us/149035'
  - url: 'https://support.apple.com/en-us/149522'
  - url: 'https://support.apple.com/en-us/149523'
tags:
  - cve.org
epss: 0.00653
epssPercentile: 0.51087
ingestedAt: '2026-10-27T16:11:59.214Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. Processing a maliciously crafted file may lead to arbitrary code execution.

## Affected

- `macOS < 15.8.2`
- `macOS < 26.7.2`
- `macOS < 27`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.