---
id: "CVE-2023-43000"
kind: "vulnerability"
aliases: ["CVE-2023-43000"]
title: "A use-after-free issue was addressed with improved memory management"
severity: "high"
cvss: 8.8
epss: null
exploited: true
status: "open"
category: "runtime"
products: [{"name": "Apple Multiple Products", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "apple safari", "fixed": ["16.6"], "affected": "< 16.6", "ecosystem": "vendor"}, {"name": "apple ipados", "fixed": ["15.8.7"], "affected": "< 15.8.7", "ecosystem": "vendor"}, {"name": "apple ipados", "fixed": ["16.6"], "affected": ">= 16.0, < 16.6", "ecosystem": "vendor"}, {"name": "apple iphone os", "fixed": ["15.8.7"], "affected": "< 15.8.7", "ecosystem": "vendor"}, {"name": "apple iphone os", "fixed": ["16.6"], "affected": ">= 16.0, < 16.6", "ecosystem": "vendor"}, {"name": "apple macos", "fixed": ["13.5"], "affected": "< 13.5", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apple-devices", "exploited", "ios", "ipados", "macos", "runtime", "safari"]
not_affected_if: ["fully-patched-devices"]
published_at: "2025-11-05T19:15:47+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43000", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-43000", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# A use-after-free issue was addressed with improved memory management

Apple macOS, iOS, iPadOS and Safari 16.6 have a use-after-free bug triggered by processing maliciously crafted web content. An attacker can corrupt memory by getting a victim to load a page, which can lead to code execution.

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

## Affected

- vendor:Apple Multiple Products affected ? fixed ?
- vendor:apple safari affected < 16.6 fixed 16.6
- vendor:apple ipados affected < 15.8.7 fixed 15.8.7
- vendor:apple ipados affected >= 16.0, < 16.6 fixed 16.6
- vendor:apple iphone os affected < 15.8.7 fixed 15.8.7
- vendor:apple iphone os affected >= 16.0, < 16.6 fixed 16.6
- vendor:apple macos affected < 13.5 fixed 13.5

## How to check

Check the installed OS and Safari versions (macOS: Apple menu > About This Mac; iOS/iPadOS: Settings > General > About). Versions older than the fixed release are exposed.

## Fix

Update macOS, iOS, iPadOS and Safari to the fixed versions Apple published for CVE-2023-43000; the sources do not name the exact build numbers. If updates cannot be applied, follow the CISA/vendor mitigation guidance.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2023-43000
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2023-43000

## From the sources

Apple macOS, iOS, iPadOS, and Safari 16.6 contain a use-after-free vulnerability due to the processing of maliciously crafted web content that may lead to memory corruption.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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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_