---
id: "CVE-2026-86963"
kind: "vulnerability"
aliases: ["CVE-2026-86963"]
title: "Apple iOS and iPadOS: input validation flaw enables network denial-of-service"
severity: "medium"
cvss: 5.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["apple", "infrastructure", "ios", "ipados", "mobile-devices"]
not_affected_if: ["already-updated-devices"]
published_at: "2026-10-20T01:17:29+00:00"
first_seen_at: "2026-10-23T21:57:19+00:00"
updated_at: "2026-10-25T04:08:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86963", "first_seen_at": "2026-10-23T21:57:19+00:00"}]
---

# Apple iOS and iPadOS: input validation flaw enables network denial-of-service

Apple fixed a denial-of-service flaw in iOS and iPadOS that is addressed by improved input validation. An attacker in a privileged network position may be able to crash or disrupt affected devices.

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

## How to check

- Open Settings > General > About on the device and read the iOS or iPadOS version
- unknown for fleet-wide checks: the sources do not name an MDM or inventory command

## Fix

- Update iOS and iPadOS to `26.7` or later on iPhone and iPad devices
- Update to iOS 27 or iPadOS 27 where the device supports it

## Timeline

- 2026-10-23T21:57:19+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-86963

## From the sources

A denial-of-service issue was addressed with improved input validation. This issue is fixed in iOS 26.7 and iPadOS 26.7, iOS 27 and iPadOS 27. An attacker in a privileged network position may be able to cause a denial-of-service.

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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_