---
id: CVE-2025-43429
title: A buffer overflow was addressed with improved bounds checking
summary: >-
  A buffer overflow was addressed with improved bounds checking. This issue is
  fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1,
  macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, watchOS 26.1. Processing
  maliciously c…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L'
cwe:
  - CWE-119
vendor: apple
product: safari
affected:
  - safari < 26.1
  - ipados < 26.1
  - iphone_os < 26.1
  - tvos < 26.1
  - visionos < 26.1
  - watchos < 26.1
patched:
  - safari 26.1
  - ipados 26.1
  - iphone_os 26.1
  - tvos 26.1
  - visionos 26.1
  - watchos 26.1
published: '2025-11-04'
updated: '2026-09-26'
sourceUpdated: '2026-09-26T00:10:00.127'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-43429'
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/125637'
    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
  - url: 'https://support.apple.com/en-us/125640'
    label: product-security@apple.com
tags:
  - nvd
epss: 0.01398
epssPercentile: 0.71284
ingestedAt: '2026-09-26T00:22:39.970Z'
---

## Overview

A buffer overflow was addressed with improved bounds checking. This issue is fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, watchOS 26.1. Processing maliciously crafted web content may lead to an unexpected process crash.

## Affected

- `safari < 26.1`
- `ipados < 26.1`
- `iphone_os < 26.1`
- `tvos < 26.1`
- `visionos < 26.1`
- `watchos < 26.1`

## Remediation

Upgrade past the affected range:

- `safari 26.1`
- `ipados 26.1`
- `iphone_os 26.1`
- `tvos 26.1`
- `visionos 26.1`
- `watchos 26.1`