HIGH CISA KEV

CVE-2026-87491

CVSS v3

8.8

HIGH

EPSS Score

0.3 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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 Known Exploited Vulnerability

Date Added: 2026-09-09
Patch Due Date: 2026-09-23
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: 3.1
Published: 2026-09-09
Last Modified: 2026-09-10
CERT-FR Advisory: CERTFR-2026-AVI-1139
CERT-FR Link: CERTFR-2026-AVI-1139

Frequently asked questions

What is CVE-2026-87491?

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)

Is CVE-2026-87491 actively exploited?

Yes. CVE-2026-87491 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-09-23.

What is the CVSS score for CVE-2026-87491?

CVE-2026-87491 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string 3.1.

Is CVE-2026-87491 affecting your environment?

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