What is CVE-2026-20679?

CVE-2026-20679 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-08-21.

How severe is CVE-2026-20679?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Out-of-bounds Read in Apple macOS

CVE-2026-20679

The issue was addressed with improved checks. This issue is fixed in macOS Sequoia 15.7.5, macOS Sonoma 14.8.5, macOS Tahoe 26.4. Processing a maliciously crafted file may lead to unexpected app termination.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.

Affected products

Apple Macos

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read
CWE-416 — Use After Free

References

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

Frequently asked questions

What is CVE-2026-20679?: CVE-2026-20679 is a medium-severity vulnerability in Apple macOS, classified under Out-of-bounds Read. CVSS score: 4.3/10. Published 2026-08-21.
How severe is CVE-2026-20679?: Medium severity. CVSS v3 base score is 4.3 out of 10.