---
id: CVE-2026-65396
title: A buffer overflow was addressed with improved size validation
summary: >-
  A buffer overflow was addressed with improved size validation. This issue is
  fixed in macOS Golden Gate 27, 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
  - macOS < 27
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-20T14:09:06.858948Z'
published: '2026-10-20'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T20:36:25.808Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-65396'
references:
  - url: 'https://support.apple.com/en-us/149035'
  - url: 'https://support.apple.com/en-us/149042'
  - url: 'https://support.apple.com/en-us/149043'
tags:
  - cve.org
epss: 0.00168
epssPercentile: 0.06104
ingestedAt: '2026-10-20T01:49:42.608Z'
---

## Overview

A buffer overflow was addressed with improved size validation. This issue is fixed in macOS Golden Gate 27, 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`
- `macOS < 27`

## Remediation

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