---
id: CVE-2026-86950
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 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, macOS
  Tahoe 26.7.1. Processing a maliciously crafted file may lead to arbitrary code
  exe…
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'
cwe:
  - CWE-787
vendor: apple
product: ipados
affected:
  - ipados < 26.7.1
  - iphone_os < 26.7.1
  - macos < 15.8.1
  - 'macos >= 26.0, < 26.7.1'
patched:
  - ipados 26.7.1
  - iphone_os 26.7.1
  - macos 26.7.1
published: '2026-09-28'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T18:17:28.430'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-86950'
references:
  - url: 'https://support.apple.com/en-us/149226'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149228'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/149229'
    label: product-security@apple.com
  - url: 'http://seclists.org/fulldisclosure/2026/Sep/89'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://seclists.org/fulldisclosure/2026/Sep/90'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'http://seclists.org/fulldisclosure/2026/Sep/91'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86950
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://support.apple.com/en-us/149225'
tags:
  - nvd
  - cve.org
  - in-the-wild
  - exploit-available
  - kev
exploited: true
exploitAvailable: true
ssvc:
  exploitation: active
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-30T03:55:58.823862Z'
epss: 0.26166
epssPercentile: 0.97984
kev: true
kevDateAdded: '2026-09-29'
kevDueDate: '2026-10-13'
kevRansomware: false
exploits:
  github: 7
  githubRepos:
    - 'https://github.com/msuiche/hotcell'
    - 'https://github.com/decalage2/detect_CVE-2026-86950'
    - 'https://github.com/34zY/CVE-2026-86950'
  checkedAt: '2026-10-27T19:19:07.444Z'
zeroDay: true
ingestedAt: '2026-09-28T20:20:05.661Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, macOS Tahoe 26.7.1. Processing a maliciously crafted file may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 27.

## Affected

- `ipados < 26.7.1`
- `iphone_os < 26.7.1`
- `macos < 15.8.1`
- `macos >= 26.0, < 26.7.1`

## Remediation

Upgrade past the affected range:

- `ipados 26.7.1`
- `iphone_os 26.7.1`
- `macos 26.7.1`