What is CVE-2026-12034?

CVE-2026-12034 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.3/10. Published 2026-06-11.

How severe is CVE-2026-12034?

High severity. CVSS v3 base score is 8.3 out of 10.

Improper input validation in Google Chrome

CVE-2026-12034

Insufficient validation of untrusted input in Linux Toolkit Theming in Google Chrome on Linux prior to 149.0.7827.115 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a maliciou…

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

EPSS: 0.002 (7.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H.

Affected products

Google Chrome — versions 149.0.7827.115
Linux Linux_kernel

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2026-12034?: CVE-2026-12034 is a high-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 8.3/10. Published 2026-06-11.
How severe is CVE-2026-12034?: High severity. CVSS v3 base score is 8.3 out of 10.