---
id: "CVE-2026-84590"
kind: "vulnerability"
aliases: ["CVE-2026-84590"]
title: "Apple macOS: out-of-bounds write lets a remote attacker corrupt heap memory"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple-devices", "infrastructure", "macos"]
not_affected_if: []
published_at: "2026-10-26T21:20:13+00:00"
first_seen_at: "2026-10-26T21:55:21+00:00"
updated_at: "2026-10-26T21:57:13+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84590", "first_seen_at": "2026-10-26T21:55:21+00:00"}]
---

# Apple macOS: out-of-bounds write lets a remote attacker corrupt heap memory

An out-of-bounds write in an unspecified macOS component can crash an app or corrupt heap memory. Apple says a remote attacker may be able to trigger it, and the description does not say what code path is involved.

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

## How to check

- Run `sw_vers -productVersion` on each Mac and compare against the fixed versions.
- Check the macOS build against the fixed releases: macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2.

## Fix

- Update macOS to `27.2` (Golden Gate), `15.8.2` (Sequoia) or `26.7.2` (Tahoe), whichever matches the installed major release.

## Timeline

- 2026-10-26T21:55:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-84590

## From the sources

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27.2, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2. A remote attacker may be able to cause unexpected app termination or heap corruption.

---

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