What is CVE-2026-43771?

CVE-2026-43771 is a high-severity vulnerability in Apple Macos, classified under Stack-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-07-27.

How severe is CVE-2026-43771?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in Apple Macos

CVE-2026-43771

A stack overflow was addressed with improved input validation. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. An app may be able to cause a denial-of-service.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

References

product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)
product-security@apple.com (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-43771?: CVE-2026-43771 is a high-severity vulnerability in Apple Macos, classified under Stack-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-07-27.
How severe is CVE-2026-43771?: High severity. CVSS v3 base score is 7.1 out of 10.