Threat Intelligence Brief
CISA KEV Alert: Google Chromium V8 (CVE-2026-87491) Actively Exploited in the Wild
Source: nvd.nist.gov
Threat Risk: Critical
Victim: Google Chromium V8 Deployments
Incident: CISA added CVE-2026-87491 (Google Chromium V8 Out of Bounds Write Vulnerability) to Known Exploited Vulnerabilities catalog.
Impact: Active in-the-wild exploitation resulting in remote code execution, authentication bypass, or data exposure.
Attacker: Unidentified Cyber Threat Actors
Analysis: 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.
Recommendations: 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.; Audit exposed interfaces and verify patching before federal deadlines.
Source: CISA Known Exploited Vulnerabilities (KEV)
Victim: Google Chromium V8 Deployments
Incident: CISA added CVE-2026-87491 (Google Chromium V8 Out of Bounds Write Vulnerability) to Known Exploited Vulnerabilities catalog.
Impact: Active in-the-wild exploitation resulting in remote code execution, authentication bypass, or data exposure.
Attacker: Unidentified Cyber Threat Actors
Analysis: 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.
Recommendations: 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.; Audit exposed interfaces and verify patching before federal deadlines.
Source: CISA Known Exploited Vulnerabilities (KEV)
Editorial note: this post summarizes high-priority intelligence and links to primary telemetry.
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