What is CVE-2026-8521?

CVE-2026-8521 is a high-severity vulnerability in Apple Macos, classified under Use After Free. CVSS score: 7.5/10. Published 2026-05-14.

How severe is CVE-2026-8521?

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

Use After Free in Apple Macos

CVE-2026-8521

Use after free in Tab Groups in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code via malicious network traffic. (Chromium security severity: Critical)

Vulnerability class: Use-After-Free

EPSS: 0.000 (13.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Apple Macos
Google Chrome — versions 148.0.7778.168
Linux Linux_kernel
Microsoft Windows

Weakness classification (CWE)

CWE-416 — Use After Free

References

chrome-cve-admin@google.com (Product, Vendor Advisory)
chrome-cve-admin@google.com (Permissions Required)

Frequently asked questions

What is CVE-2026-8521?: CVE-2026-8521 is a high-severity vulnerability in Apple Macos, classified under Use After Free. CVSS score: 7.5/10. Published 2026-05-14.
How severe is CVE-2026-8521?: High severity. CVSS v3 base score is 7.5 out of 10.