CVE-2019-8539: Apple Mac OS X

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Mojave 10.14.6, Security Update 2019-004 High Sierra, Security Update 2019-004 Sierra. A malicious application may be able to execute arbitrary code with system privileges.

Affected products

• Apple Mac OS X: from 10.14.5, before 10.14.6 (fixed in 10.14.6)

Published 2020-10-27. Last modified 2026-06-17.