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CVE-2026-87491

Google Chromium V8•HIGH · CVSS 8.8• In the wild In CISA KEV

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)

CVSS8.8 NVD 3.1

SeverityHIGH

Exploitation In the wild In CISA KEV

EPSS3% · P88

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWECWE-787

NVD published2026-09-09

NVD last modified2026-09-21

Timeline

2026-09-09Published to the U.S. National Vulnerability Database (NVD)
2026-09-09Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-11First covered in a defend.network daily briefing
2026-09-21NVD record last updated
2026-09-23CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Google Chromium V8 Out of Bounds Write Vulnerability

Added to KEV2026-09-09

Federal patch deadline2026-09-23

Known ransomware useUnknown

Affected product

Google Chromium V8

Remediation Steps

Apply the vendor security update for Google Chromium V8 as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
Android malware surge; AI-powered PaperCut campaign hits 395+ orgs (2026-09-11)

Related vulnerabilities

CVE-2026-85046 – Google Chromium V8 (same product)
CVE-2026-11645 – Google Chromium V8 (same product)
CVE-2026-5281 – Google Dawn (same product)
CVE-2026-58704 – Google Pixel (same vendor)
CVE-2025-48595 – Android Framework (same vendor)
CVE-2026-86950 – Apple Multiple Products (same weakness: CWE-787)

Google: 75 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.