{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40209", "assignerOrgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981", "state": "PUBLISHED", "assignerShortName": "OX", "dateReserved": "2026-04-10T07:11:39.060Z", "datePublished": "2026-06-25T12:23:05.694Z", "dateUpdated": "2026-06-25T13:56:22.793Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8ce71d90-2354-404b-a86e-bec2cc4e6981", "shortName": "OX", "dateUpdated": "2026-06-25T12:23:05.694Z"}, "title": "Denial of service via IXFR queries", "datePublic": "2026-06-24T22:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "description": "Missing Release of Resource after Effective Lifetime", "type": "CWE"}]}], "affected": [{"vendor": "PowerDNS", "product": "DNSdist", "collectionURL": "https://repo.powerdns.com/", "packageName": "dnsdist", "repo": "https://github.com/PowerDNS/pdns", "modules": ["DNS over TCP to the backend"], "programFiles": ["dnsdist-tcp-downstream.cc"], "versions": [{"status": "affected", "version": "1.9.0", "lessThan": "1.9.15", "versionType": "semver"}, {"status": "affected", "version": "2.0.0", "lessThan": "2.0.7", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.</p>"}]}], "references": [{"url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseSeverity": "MEDIUM", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}}], "credits": [{"lang": "en", "value": "Qifan Zhang (Palo Alto Networks)", "type": "finder"}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-772", "lang": "en", "description": "CWE-772 Missing Release of Resource after Effective Lifetime"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-25T13:56:17.791790Z", "id": "CVE-2026-40209", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-25T13:56:22.793Z"}}]}}

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