CVE-2026-34550 iccDEV整数转换导致未定义行为漏洞

// PoC for CVE-2026-34550: Integer conversion to size_t // This demonstrates the Undefined Behavior (UB) described. // The actual trigger requires a specific malformed ICC profile input // that leads to a negative value being read and used as a size. #include <iostream> #include <vector> #include <cstddef> // Simulated vulnerable function pattern based on description void processICCData(int tagCount) { // Vulnerable: Implicit conversion from signed 'int' to unsigned 'size_t' // If tagCount is negative, it becomes a huge positive number. size_t bufferSize = tagCount; std::cout << "Input tagCount: " << tagCount << std::endl; std::cout << "Converted bufferSize: " << bufferSize << std::endl; // This allocation might fail or consume all memory try { std::vector<char> buffer(bufferSize); std::cout << "Allocation attempted." << std::endl; } catch (const std::bad_alloc& e) { std::cerr << "Memory allocation failed (DoS triggered)." << std::endl; } } int main() { // Simulate a negative value read from a crafted ICC file int maliciousInput = -1; processICCData(maliciousInput); return 0; }