CVE-2018-4126: Apple iCloud

High severity, CVSS 7.8. EPSS: 1.9% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5, iTunes 12.9 for Windows, iCloud for Windows 7.7.

Affected products

• Apple iCloud: before 7.7 (fixed in 7.7)
• Apple iPhone OS: before 12.0 (fixed in 12.0)
• Apple iTunes: before 12.9 (fixed in 12.9)
• Apple Mac OS X: before 10.14 (fixed in 10.14)
• Apple tvOS: before 12 (fixed in 12)
• Apple watchOS: before 5.0 (fixed in 5.0)

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