What is CVE-2026-87527?

CVE-2026-87527 is a critical-severity vulnerability in Google Chrome, classified under Heap-based Buffer Overflow. CVSS score: 9.6/10. Published 2026-09-09.

How severe is CVE-2026-87527?

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

Buffer overflow in Google Chrome

CVE-2026-87527

Buffer overflow in WebGL in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

Vulnerability class: Buffer Overflow

Published 2026-09-09 · last modified 2026-09-10.

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: 0.005 (42.4th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/548130125 (Permissions Required)

Frequently asked questions

What is CVE-2026-87527?: CVE-2026-87527 is a critical-severity vulnerability in Google Chrome, classified under Heap-based Buffer Overflow. CVSS score: 9.6/10. Published 2026-09-09.
How severe is CVE-2026-87527?: Critical severity. CVSS v3 base score is 9.6 out of 10.