CVE-2019-8642: Apple Mac OS X

Low severity, CVSS 3.3. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue existed in the handling of S-MIME certificates. This issue was addressed with improved validation of S-MIME certificates. This issue is fixed in macOS Mojave 10.14.4, Security Update 2019-002 High Sierra, Security Update 2019-002 Sierra. Processing a maliciously crafted mail message may lead to S/MIME signature spoofing.

Affected products

• Apple Mac OS X: before 10.14.4 (fixed in 10.14.4)

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