CVE-2018-4276: Apple Mac OS X

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

A null pointer dereference was addressed with improved validation. This issue affected versions prior to macOS High Sierra 10.13.6.

Affected products

• Apple Mac OS X: before 10.13.6 (fixed in 10.13.6)

Published 2019-04-03. Last modified 2026-06-17.