What is CVE-2026-64703?

CVE-2026-64703 is a critical-severity vulnerability in Apple Macos, classified under Use After Free. CVSS score: 9.8/10. Published 2026-07-27.

How severe is CVE-2026-64703?

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

Use After Free in Apple Macos

CVE-2026-64703

A use after free issue was addressed with improved memory management. 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: Use-After-Free

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-416 — Use After Free

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-2026-64703?: CVE-2026-64703 is a critical-severity vulnerability in Apple Macos, classified under Use After Free. CVSS score: 9.8/10. Published 2026-07-27.
How severe is CVE-2026-64703?: Critical severity. CVSS v3 base score is 9.8 out of 10.