---
id: "CVE-2026-65396"
kind: "vulnerability"
aliases: ["CVE-2026-65396"]
title: "Apple macOS: buffer overflow lets an app crash the system"
severity: "medium"
cvss: 5.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple", "endpoints", "infrastructure", "macos"]
not_affected_if: ["already-patched-macos"]
published_at: "2026-10-20T01:17:18+00:00"
first_seen_at: "2026-10-23T21:57:19+00:00"
updated_at: "2026-10-25T04:12:40+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65396", "first_seen_at": "2026-10-23T21:57:19+00:00"}]
---

# Apple macOS: buffer overflow lets an app crash the system

A buffer overflow in macOS allowed by insufficient size validation can be triggered by an app. Per the description, it can cause unexpected system termination.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `sw_vers` and compare the ProductVersion against the fixed releases listed in Fix.

## Fix

- Update macOS Golden Gate to `27`, macOS Sequoia to `15.8`, or macOS Tahoe to `26.7` (or later) via Software Update.

## Timeline

- 2026-10-23T21:57:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-65396

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_