CVE-2025-43526: Apple macOS

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac with Lockdown Mode enabled, web content opened via a file URL may be able to use Web APIs that should be restricted.

Affected products

• Apple macOS: before 26.2 (fixed in 26.2)
• Apple Safari: before 26.2 (fixed in 26.2)

Published 2025-12-17. Last modified 2026-06-17.