What is CVE-2026-87489?

CVE-2026-87489 is a high-severity vulnerability in Google Chrome, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-09-09.

How severe is CVE-2026-87489?

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

Buffer overflow in Google Chrome

CVE-2026-87489

Memory corruption in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially execute arbitrary code inside the sandbox via a crafted Chrome extension. (Chromium security severity: Low)

Vulnerability class: Buffer Overflow

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

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.

EPSS exploit prediction

EPSS: 0.004 (31.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Google Chrome

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145… (Release Notes, Vendor Advisory)
issues.chromium.org/issues/539453394 (Permissions Required)

Frequently asked questions

What is CVE-2026-87489?: CVE-2026-87489 is a high-severity vulnerability in Google Chrome, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-09-09.
How severe is CVE-2026-87489?: High severity. CVSS v3 base score is 8.8 out of 10.