CVE-2018-4248: Apple iPhone OS

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

An out-of-bounds read was addressed with improved input validation. This issue affected versions prior to iOS 11.4.1, macOS High Sierra 10.13.6, tvOS 11.4.1, watchOS 4.3.2.

Affected products

• Apple iPhone OS: before 11.4.1 (fixed in 11.4.1)
• Apple Mac OS X: before 10.13.6 (fixed in 10.13.6)
• Apple tvOS: before 11.4.1 (fixed in 11.4.1)
• Apple watchOS: before 4.3.2 (fixed in 4.3.2)

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