Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since September 9, 2026.
CVE-2026-87491
Google Chromium V8 Out of Bounds Write Vulnerability
Added to KEV September 9, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2026-87491
- CWE
- CWE-787
- Affected products
- Chromium V8 · Google Chromium V8 · Google
What happened
Google Chromium V8 contains an out of bounds write vulnerability that allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.
What it means for your business
Google Chromium V8 is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2026-87491). Google Chromium V8 contains an out of bounds write vulnerability that allows a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera. CISA remediation due date: 2026-09-23. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: September 23, 2026
Sources
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