---
id: CVE-2026-86953
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 iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27,
  visionOS 27, watchOS 27. An attacker in physical proximity may be able to
  cause a denia…
severity: medium
cvss: 4.6
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
vendor: Apple
product: iOS and iPadOS
affected:
  - ios_and_ipados < 27
  - macOS < 27
  - tvOS < 27
  - visionOS < 27
  - watchOS < 27
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T10:25:19.070243Z'
published: '2026-10-20'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T20:43:08.570Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-86953'
references:
  - url: 'https://support.apple.com/en-us/149034'
  - url: 'https://support.apple.com/en-us/149035'
  - url: 'https://support.apple.com/en-us/149036'
  - url: 'https://support.apple.com/en-us/149037'
  - url: 'https://support.apple.com/en-us/149038'
tags:
  - cve.org
epss: 0.00232
epssPercentile: 0.13999
ingestedAt: '2026-10-20T01:49:42.587Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27, tvOS 27, visionOS 27, watchOS 27. An attacker in physical proximity may be able to cause a denial-of-service.

## Affected

- `ios_and_ipados < 27`
- `macOS < 27`
- `tvOS < 27`
- `visionOS < 27`
- `watchOS < 27`

## Remediation

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