---
id: CVE-2026-86981
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 Sequoia 15.8, macOS Tahoe 26.7. An app may be able to
  cause unexpected system termination.
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
vendor: Apple
product: macOS
affected:
  - macOS < 15.8
  - macOS < 26.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T10:11:41.422786Z'
published: '2026-10-20'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T20:41:24.342Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-86981'
references:
  - url: 'https://support.apple.com/en-us/149042'
  - url: 'https://support.apple.com/en-us/149043'
tags:
  - cve.org
epss: 0.00134
epssPercentile: 0.02886
ingestedAt: '2026-10-20T01:49:42.585Z'
---

## Overview

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Sequoia 15.8, macOS Tahoe 26.7. An app may be able to cause unexpected system termination.

## Affected

- `macOS < 15.8`
- `macOS < 26.7`

## Remediation

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