What is CVE-2026-11659?

CVE-2026-11659 is a critical-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-06-09.

How severe is CVE-2026-11659?

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

Improper input validation in Google Chrome

CVE-2026-11659

Integer overflow in UI in Google Chrome on Linux prior to 149.0.7827.103 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

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

Published 2026-06-09 · last modified 2026-07-23.

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.

EPSS exploit prediction

EPSS: 0.003 (15.1th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Google Chrome — versions 149.0.7827.103
Linux Kernel

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop_0153744… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/513702971 (Permissions Required)

Frequently asked questions

What is CVE-2026-11659?: CVE-2026-11659 is a critical-severity vulnerability in Google Chrome, classified under Improper Input Validation. CVSS score: 9.6/10. Published 2026-06-09.
How severe is CVE-2026-11659?: Critical severity. CVSS v3 base score is 9.6 out of 10.