Overview
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)
CVE intelligenceCISA KEV
CVE-2026-87491
Google Chromium V8 Out of Bounds Write Vulnerability
8.8HIGHCVSS out of 10
What this means
Actively exploited
CISA lists CVE-2026-87491 in its Known Exploited Vulnerabilities catalog, which means exploitation has been observed. The entry applies to Google Chromium V8.
- 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.
CISA KEVListedObserved exploitation
EPSS0.9%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors1Source-linked actor relationships