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

> CVE-2026-87491: Google Chromium V8 Out of Bounds Write Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-87491
Last updated: 2026-09-21T13:17:11Z

- Published: 2026-09-09 00:09 UTC · Updated: 2026-09-21 13:17 UTC · Assigner: Chrome
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 3.5%, 89th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-09-09, federal due date 2026-09-23, ransomware use: Unknown
- CWE: 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)

## CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

## Affected vendors and products

- Google: Chrome

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-87491)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-87491)
- [https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop\_0808145027.html](https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html)
- [https://issues.chromium.org/issues/543557673](https://issues.chromium.org/issues/543557673)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-87491 · Markdown: https://rewindex.com/cve/CVE-2026-87491.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-87491 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:16.692Z