CVE-2026-87491

Published Sep 9, 2026

Last updated 6 hours ago

Overview

AI description

Automated description summarized from trusted sources.

CVE-2026-87491 is an out-of-bounds write vulnerability found in V8, Google Chrome's JavaScript and WebAssembly engine. This flaw allows a remote attacker to execute arbitrary code within the browser's sandbox by enticing a user to visit a specially crafted HTML page. The vulnerability was reported by Jihyeon Jeong of the Compsec Lab at Seoul National University on August 6, 2026. Google has confirmed that an exploit for CVE-2026-87491 exists in the wild, making it an actively exploited zero-day vulnerability. The issue has been addressed in Chrome version 153.0.8010.36 for Windows, macOS, and Linux, and is the seventh actively exploited Chrome zero-day patched by Google in 2026.

Description: 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)
Source: chrome-cve-admin@google.com
NVD status: Modified
Products: chrome

Risk scores

CVSS 3.1

Type: Secondary
Base score: 8.8
Impact score: 5.9
Exploitability score: 2.8
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Severity: HIGH

Known exploits

Data from CISA

Vulnerability name: Google Chromium V8 Out of Bounds Write Vulnerability
Exploit added on: Sep 9, 2026
Exploit action due: Sep 23, 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.

Weaknesses

chrome-cve-admin@google.com: CWE-787

Hype score is a measure of social media activity compared against trending CVEs from the past 12 months. Max score 100.

Hype score: 10

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "7BC1B89D-DEB1-48BD-8602-0869B89600FD",
            "versionEndExcluding": "153.0.8010.36",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.