What is CVE-2026-84543?

CVE-2026-84543 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-09-14.

How severe is CVE-2026-84543?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Apple macOS

CVE-2026-84543

An out-of-bounds access 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 cause unexpected system termination or corrupt kernel memory.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Apple Macos

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

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

Frequently asked questions

What is CVE-2026-84543?: CVE-2026-84543 is a high-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-09-14.
How severe is CVE-2026-84543?: High severity. CVSS v3 base score is 7.5 out of 10.