CVE-2026-34672 CAI Content Credentials整数下溢漏洞

# Proof of Concept for Integer Underflow (DoS) # This script simulates the logic that leads to a crash due to memory allocation issues. def process_data(input_size): # Simulating vulnerable code: input_size is trusted and used in calculation # If input_size is small, e.g., 5, the subtraction causes an underflow in unsigned context # Here we simulate the impact of such a wraparound try: # Vulnerable logic simulation # In a real scenario, this might be: new_size = size - header_length if input_size < 20: print(f"Input size too small, attempting risky operation...") # Simulating wraparound to a huge number # (e.g. 5 - 10 in 32-bit unsigned int becomes a huge number) allocated_size = (input_size - 10) % (2**32) print(f"Attempting to allocate {allocated_size} bytes...") # This allocation attempt will likely cause MemoryError or crash the app dummy_buffer = ['A'] * allocated_size print("Operation successful (unexpected)") else: print("Safe operation") except MemoryError: print("Application crashed: Out of Memory (DoS triggered)") except Exception as e: print(f"Application crashed: {e}") # Triggering the vulnerability with a small input that causes underflow process_data(5)