What is CVE-2026-84515?

CVE-2026-84515 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-09-14.

How severe is CVE-2026-84515?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Apple macOS

CVE-2026-84515

An out-of-bounds write issue 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 kernel memory corruption.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apple Macos

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

product-security@apple.com
product-security@apple.com
product-security@apple.com

Frequently asked questions

What is CVE-2026-84515?: CVE-2026-84515 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-09-14.
How severe is CVE-2026-84515?: High severity. CVSS v3 base score is 7.8 out of 10.