---
id: CVE-2025-43494
title: A mail header parsing issue was addressed with improved checks
summary: >-
  A mail header parsing issue was addressed with improved checks. This issue is
  fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia
  15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. An
  a…
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-20
vendor: apple
product: ipados
affected:
  - ipados < 18.7.2
  - ipados = 26.0
  - iphone_os < 18.7.2
  - iphone_os = 26.0
  - 'macos >= 14.0, < 14.8.2'
  - 'macos >= 15.0, < 15.7.2'
  - macos = 26.0
  - visionos < 26.1
  - watchos < 26.1
patched:
  - ipados 18.7.2
  - iphone_os 18.7.2
  - macos 15.7.2
  - visionos 26.1
  - watchos 26.1
published: '2025-12-12'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T20:10:00.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-43494'
references:
  - url: 'https://support.apple.com/en-us/125632'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125633'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125634'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125635'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125636'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125638'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/125639'
    label: product-security@apple.com
tags:
  - nvd
epss: 0.00573
epssPercentile: 0.45291
ingestedAt: '2026-09-30T20:23:19.450Z'
---

## Overview

A mail header parsing issue was addressed with improved checks. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1. An attacker may be able to cause a persistent denial-of-service.

## Affected

- `ipados < 18.7.2`
- `ipados = 26.0`
- `iphone_os < 18.7.2`
- `iphone_os = 26.0`
- `macos >= 14.0, < 14.8.2`
- `macos >= 15.0, < 15.7.2`
- `macos = 26.0`
- `visionos < 26.1`
- `watchos < 26.1`

## Remediation

Upgrade past the affected range:

- `ipados 18.7.2`
- `iphone_os 18.7.2`
- `macos 15.7.2`
- `visionos 26.1`
- `watchos 26.1`