CVE-2026-20700: Apple Multiple Buffer Overflow Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2026-02-12. EPSS: 1.4% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.

Affected products

• Apple iPadOS: before 26.3 (fixed in 26.3)
• Apple iPhone OS: before 26.3 (fixed in 26.3)
• Apple macOS: before 26.3 (fixed in 26.3)
• Apple tvOS: before 26.3 (fixed in 26.3)
• Apple visionOS: before 26.3 (fixed in 26.3)
• Apple watchOS: before 26.3 (fixed in 26.3)

Published 2026-02-11. Last modified 2026-06-17.