---
id: "CVE-2019-8526"
kind: "vulnerability"
aliases: ["CVE-2019-8526"]
title: "apple mac os x: A use after free issue was addressed with improved memory management"
severity: "high"
cvss: 7.8
epss: null
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Apple macOS", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "apple mac os x", "fixed": ["10.14.4"], "affected": "< 10.14.4", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["apple", "exploited", "infrastructure", "macos"]
not_affected_if: ["fully-patched-macos"]
published_at: "2019-12-18T18:15:24+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T22:29:04+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-8526", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-8526", "first_seen_at": "2026-10-23T22:29:04+00:00"}]
---

# apple mac os x: A use after free issue was addressed with improved memory management

Apple macOS has a use-after-free memory bug that lets a local user escalate privileges. CISA lists it as actively exploited in the wild.

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

## Affected

- vendor:Apple macOS affected ? fixed ?
- vendor:apple mac os x affected < 10.14.4 fixed 10.14.4

## Fix

Apply the macOS updates per Apple's vendor instructions, as CISA requires; the fixed version is unknown from these sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2019-8526
- 2026-10-23T22:29:04+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2019-8526

## From the sources

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Mojave 10.14.4. An application may be able to gain elevated privileges.

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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_