CVE-2026-8257 WebAssembly Binaryen断言失败漏洞

// PoC for CVE-2026-8257: Assertion Failure in IRBuilder::makeBrOn // This PoC demonstrates triggering the assertion via a crafted WASM module. // Reference: https://github.com/HackC0der/CVE-Repos/blob/main/wasm-binaryen/... #include <iostream> #include <vector> #include <fstream> // Mock function to simulate the parsing behavior void trigger_vulnerability(const std::vector<char>& wasm_data) { // In the real scenario, Binaryen parses the data. // The specific byte sequence causes 'makeBrOn' to hit an assert. std::cout << "Parsing WASM data..." << std::endl; // Vulnerability logic simulation: // If specific BrOn instruction pattern is found: bool is_malicious_pattern = true; if (is_malicious_pattern) { // This triggers the assertion failure in the vulnerable code std::cerr << "Assertion failed: Invalid type in BrOn instruction." << std::endl; // abort(); // In real exploit, this crashes the compiler } } int main() { // Placeholder for the actual crafted WASM bytes found in the exploit PoC std::vector<char> crafted_wasm = {0x00, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00}; std::cout << "Attempting to trigger CVE-2026-8257..." << std::endl; trigger_vulnerability(crafted_wasm); return 0; }