---
id: "CVE-2026-84539"
kind: "vulnerability"
aliases: ["CVE-2026-84539"]
title: "Apple macOS: out-of-bounds write can crash the system via an app"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple-devices", "infrastructure", "macos"]
not_affected_if: ["fixed-macos-version"]
published_at: "2026-10-26T21:20:05+00:00"
first_seen_at: "2026-10-26T21:55:21+00:00"
updated_at: "2026-10-26T21:57:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84539", "first_seen_at": "2026-10-26T21:55:21+00:00"}]
---

# Apple macOS: out-of-bounds write can crash the system via an app

An out-of-bounds write flaw in an unspecified macOS component was fixed with better bounds checking. A malicious app may be able to force an unexpected system termination, which is a denial-of-service effect.

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

## How to check

- unknown

## Fix

- Update macOS to Golden Gate 27 or macOS Tahoe 26.7.2 or later, per the advisory.

## Timeline

- 2026-10-26T21:55:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-84539

## From the sources

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Tahoe 26.7.2. An app may be able to cause unexpected system termination.

---

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