---
id: CVE-2025-43434
title: A use-after-free issue was addressed with improved memory management
summary: >-
  A use-after-free issue was addressed with improved memory management. 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, visionOS 26.1, watchOS 26.1. Processing
  maliciously craft…
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-416
vendor: apple
product: safari
affected:
  - safari < 26.1
  - ipados < 26.1
  - iphone_os < 26.1
  - visionos < 26.1
  - watchos < 26.1
patched:
  - safari 26.1
  - ipados 26.1
  - iphone_os 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-2025-43434'
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/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: 0.01198
epssPercentile: 0.66817
ingestedAt: '2026-09-26T00:22:39.970Z'
---

## Overview

A use-after-free issue was addressed with improved memory management. 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, visionOS 26.1, watchOS 26.1. Processing maliciously crafted web content may lead to an unexpected Safari crash.

## Affected

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

## Remediation

Upgrade past the affected range:

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