---
id: "CVE-2026-86942"
kind: "vulnerability"
aliases: ["CVE-2026-86942"]
title: "Apple iOS and macOS: out-of-bounds read lets an app crash the system"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["apple-devices", "ios", "ipados", "macos", "other", "visionos"]
not_affected_if: ["already-patched-version"]
published_at: "2026-10-26T21:20:31+00:00"
first_seen_at: "2026-10-26T21:55:22+00:00"
updated_at: "2026-10-26T21:56:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86942", "first_seen_at": "2026-10-26T21:55:22+00:00"}]
---

# Apple iOS and macOS: out-of-bounds read lets an app crash the system

An out-of-bounds read in Apple's operating systems lets a malicious app trigger a denial of service. The sources say the flaw is fixed by bounds checking in the listed Apple releases.

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

## How to check

- Check the device OS version in Settings > General > About (iOS, iPadOS, visionOS) or with `sw_vers` on macOS.
- unknown for any other check; the sources do not say which component is affected.

## Fix

- Update iOS and iPadOS to `26.7.2` or later, or to iOS 27 and iPadOS 27.
- Update macOS Tahoe to `26.7.2`, macOS Sequoia to `15.8.2`, or to macOS Golden Gate 27.
- Update visionOS to 27.

## Timeline

- 2026-10-26T21:55:22+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-86942

## From the sources

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in iOS 26.7.2 and iPadOS 26.7.2, iOS 27 and iPadOS 27, macOS Golden Gate 27, macOS Sequoia 15.8.2, macOS Tahoe 26.7.2, visionOS 27. An app may be able to cause a denial-of-service.

---

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