Snapshot of public data from 30 Oct 2026, 10:41:14. This data is not updated until the API is deployed.

TACTICThreat Analysis & Cyber Threat Intelligence Center
System themeFrançais

Back to the watch

CVE-2026-87491

Google Chromium V8 Out of Bounds Write Vulnerability

UrgentCVSS 8.8 v3.1Exploited

Why this priority

?

Generic watch priority computed by public, versioned rules. It does not know your assets. See the glossary

  • Présent dans le catalogue CISA KEV (exploitation confirmée)

Description

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.

Affected products

VendorProductVersions
GoogleChrome
  • from 153.0.8010.36 to 153.0.8010.36 excluded
GoogleChromium V8All versions

Revision history

  1. Revision 2

    Update : Affected versions changed

  2. Revision 1

    New record

Qualification

CVSS severity
?

Technical severity score between 0 and 10, with its version (3.1, 4.0). See the glossary

8.8 HIGH CVSS v3.1CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
KEV catalog
?

CISA catalog of vulnerabilities with confirmed exploitation. Absence from the catalog does not prove absence of exploitation. See the glossary

Listed
Exploitation
Confirmed
EPSS probability
?

Probability, between 0 and 1, that a vulnerability is exploited in the next 30 days, published daily by FIRST. Always dated. See the glossary

Unknown
Confidence
?

Quality of the sources behind the record. It is not a risk score. See the glossary

High

Priority rules, version 1

CISA KEV catalog

Added on
9 September 2026
Federal due date
23 September 2026
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.
Ransomware use
Unknown

Record

Published on
9 September 2026
Weaknesses (CWE)
CWE-787

Sources

References

CVE-2026-87491 Google Chromium V8 Out of Bounds Write Vulnerability · Avanguard TACTIC