---
id: CVE-2026-86876
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 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden
  Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, visionOS 27, watchOS 27. A
  sandb…
severity: medium
cvss: 5.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-787
vendor: apple
product: ipados
affected:
  - ipados < 26.7
  - iphone_os < 26.7
  - 'macos >= 15.0, < 15.8'
  - 'macos >= 26.0, < 26.7'
  - visionos < 27.0
  - watchos < 27.0
patched:
  - ipados 26.7
  - iphone_os 26.7
  - macos 26.7
  - visionos 27.0
  - watchos 27.0
published: '2026-09-14'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T17:28:22.230'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86876'
references:
  - url: 'https://support.apple.com/en-us/149034'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149035'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149037'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149038'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149041'
    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
epss: 0.00154
epssPercentile: 0.03769
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T22:50:41.690826Z'
ingestedAt: '2026-09-14T21:15:17.462Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7, visionOS 27, watchOS 27. A sandboxed process may be able to circumvent sandbox restrictions.

## Affected

- `ipados < 26.7`
- `iphone_os < 26.7`
- `macos >= 15.0, < 15.8`
- `macos >= 26.0, < 26.7`
- `visionos < 27.0`
- `watchos < 27.0`

## Remediation

Upgrade past the affected range:

- `ipados 26.7`
- `iphone_os 26.7`
- `macos 26.7`
- `visionos 27.0`
- `watchos 27.0`