---
id: CVE-2026-28983
title: A type confusion issue was addressed with improved checks
summary: >-
  A type confusion issue was addressed with improved checks. This issue is fixed
  in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia
  15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5,
  watchOS 26.5…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-843
vendor: apple
product: ipados
affected:
  - ipados < 18.7.9
  - 'ipados >= 26.0, < 26.5'
  - iphone_os < 18.7.9
  - 'iphone_os >= 26.0, < 26.5'
  - 'macos >= 26.0, < 26.5'
  - tvos < 26.5
  - visionos < 26.5
  - watchos < 26.5
patched:
  - ipados 26.5
  - iphone_os 26.5
  - macos 26.5
  - tvos 26.5
  - visionos 26.5
  - watchos 26.5
published: '2026-05-11'
updated: '2026-07-27'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-28983'
references:
  - url: 'https://support.apple.com/en-us/127110'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/127111'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/127115'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/127118'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/127119'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/127120'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/128071'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/128072'
    label: product-security@apple.com
tags:
  - nvd
epss: 0.00808
epssPercentile: 0.55383
ingestedAt: '2026-07-27T21:24:36.842Z'
---

## Overview

A type confusion issue was addressed with improved checks. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. A remote attacker may be able to cause a denial of service.

## Affected

- `ipados < 18.7.9`
- `ipados >= 26.0, < 26.5`
- `iphone_os < 18.7.9`
- `iphone_os >= 26.0, < 26.5`
- `macos >= 26.0, < 26.5`
- `tvos < 26.5`
- `visionos < 26.5`
- `watchos < 26.5`

## Remediation

Upgrade past the affected range:

- `ipados 26.5`
- `iphone_os 26.5`
- `macos 26.5`
- `tvos 26.5`
- `visionos 26.5`
- `watchos 26.5`