What is CVE-2026-16421?

CVE-2026-16421 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-07-21.

How severe is CVE-2026-16421?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Google Chrome

CVE-2026-16421

Inappropriate implementation in WebAudio in Google Chrome prior to 150.0.7871.182 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.003 (25.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Google Chrome — versions 150.0.7871.182

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2026-16421?: CVE-2026-16421 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2026-07-21.
How severe is CVE-2026-16421?: High severity. CVSS v3 base score is 8.8 out of 10.