CVE-2026-9888

Description

Use after free in WebView in Google Chrome on Android 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: Critical)

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 (Android) < 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-2026-9888
  This HTML page demonstrates the trigger vector for the Use-After-Free in WebView.
  Note: Exploitation requires compromising the renderer process first.
-->
<html>
<head>
    <title>CVE-2026-9888 PoC</title>
</head>
<body>
    <script>
        // Simulate the object lifecycle that leads to UAF
        function triggerUAF() {
            // 1. Allocate vulnerable object
            let target = document.createElement('div');
            document.body.appendChild(target);

            // 2. Perform operations that lead to internal state change
            // ... (Specific Chromium API calls omitted for brevity)

            // 3. Trigger the free (removal from DOM)
            document.body.removeChild(target);

            // 4. Attempt to reuse the memory (UAF trigger)
            // If garbage collection hasn't occurred, this might access freed memory
            try {
                target.innerHTML = "Exploit";
                console.log("Potential UAF triggered");
            } catch (e) {
                console.log("Error: " + e);
            }
        }

        // Execute trigger
        triggerUAF();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9888
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9888
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9888/
[4] VulDB https://vuldb.com/cve/CVE-2026-9888
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/511715166

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9888", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:46.787", "lastModified": "2026-05-29T16:16:34.930", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in WebView in Google Chrome on Android 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: Critical)"}], "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/511715166", "source": "[email protected]"}]}}