What is CVE-2026-12027?

CVE-2026-12027 is a critical-severity vulnerability in Apple Macos, classified under CWE-250. CVSS score: 9.6/10. Published 2026-06-11.

How severe is CVE-2026-12027?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Apple Macos

CVE-2026-12027

Inappropriate implementation in Headless in Google Chrome prior to 149.0.7827.115 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severi…

EPSS: 0.002 (13.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Apple Macos
Google Chrome — versions 149.0.7827.115
Linux Linux_kernel
Microsoft Windows

Weakness classification (CWE)

CWE-250
CWE-693 — Protection Mechanism Failure

References

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

Frequently asked questions

What is CVE-2026-12027?: CVE-2026-12027 is a critical-severity vulnerability in Apple Macos, classified under CWE-250. CVSS score: 9.6/10. Published 2026-06-11.
How severe is CVE-2026-12027?: Critical severity. CVSS v3 base score is 9.6 out of 10.