What is CVE-2026-64738?

CVE-2026-64738 is a critical-severity vulnerability in Apple Macos, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-07-27.

How severe is CVE-2026-64738?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Apple Macos

CVE-2026-64738

A permissions issue was addressed with additional restrictions. This issue is fixed in macOS Sequoia 15.7.8, macOS Sonoma 14.8.8, macOS Tahoe 26.6. A malicious app may be able to break out of its sandbox.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Apple Macos — versions 0

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

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

Frequently asked questions

What is CVE-2026-64738?: CVE-2026-64738 is a critical-severity vulnerability in Apple Macos, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-07-27.
How severe is CVE-2026-64738?: Critical severity. CVSS v3 base score is 9.8 out of 10.