CVE-2026-84509: Apple macOS

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

An out-of-bounds read was addressed with improved bounds checking. This issue is fixed in macOS Golden Gate 27, macOS Sequoia 15.8, macOS Tahoe 26.7. Connecting to a malicious SMB server may lead to unexpected system termination.

Affected products

• Apple macOS: from 15.0, before 15.8 (fixed in 15.8); from 26.0, before 26.7 (fixed in 26.7)

Published 2026-09-14. Last modified 2026-09-17.