CVE-2026-35199 Windows SymCrypt堆缓冲区溢出漏洞

#include <stdio.h> #include <stdint.h> // Mock helper function that accepts a 32-bit parameter void HelperFunction(uint32_t leaf_count) { printf("Helper received (truncated): %u\n", leaf_count); // In the real vulnerability, this leads to a small buffer allocation } // Vulnerable function logic simulation void SymCryptXmssSign_Vulnerable(uint64_t leaf_count) { // The bug: passing 64-bit value directly to 32-bit parameter // If leaf_count >= 2^32 (e.g., height >= 32), it gets truncated. HelperFunction(leaf_count); } int main() { // Simulate a large leaf count for a tree height >= 32 // 2^32 is a common threshold for 32-bit truncation uint64_t large_count = 1ULL << 32; printf("Original 64-bit count: %llu\n", large_count); // Trigger the vulnerable logic SymCryptXmssSign_Vulnerable(large_count); return 0; }