CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2026-09-09
EPSS: 3.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-09 · updated 2026-09-21
Weakness: CWE-787

Description

Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

Affected products

Google Chrome: before 153.0.8010.36 — fixed in 153.0.8010.36

How to fix

Upgrade to a fixed version: Google Chrome 153.0.8010.36. Check the vendor advisory for mitigations.

References

https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html
https://issues.chromium.org/issues/543557673
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-87491

Get alerted when CVE-2026-87491 or the next vulnerability affects your stack