CVE-2026-86900: Apple macOS

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An out-of-bounds read issue was addressed with improved input validation. This issue is fixed in macOS Golden Gate 27. Mounting a maliciously crafted exFAT volume may cause unexpected system termination or kernel memory disclosure.

Affected products

• Apple macOS: before 27.0 (fixed in 27.0)

Published 2026-09-14. Last modified 2026-09-18.