CVE-2026-42004

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{"affected": [{"affectedData": [{"collectionURL": "https://repo.powerdns.com/", "defaultStatus": "unaffected", "modules": ["EDNS processing"], "packageName": "dnsdist", "product": "DNSdist", "programFiles": ["dnsdist-ecs.cc"], "repo": "https://github.com/PowerDNS/pdns", "vendor": "PowerDNS", "versions": [{"lessThan": "1.9.15", "status": "affected", "version": "1.9.0", "versionType": "semver"}, {"lessThan": "2.0.7", "status": "affected", "version": "2.0.0", "versionType": "semver"}]}], "source": "security@open-xchange.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist\u2019s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS option(s) that DNSdist did not filter."}, {"lang": "es", "value": "Un atacante puede enviar un registro EDNS OPT manipulado que ser\u00e1 ignorado por las reglas de filtrado de DNSdist, pero ser\u00e1 reescrito como un registro OPT v\u00e1lido cuando se inserte EDNS Client Subnet, haciendo que el backend vea la(s) opci\u00f3n(es) EDNS que DNSdist no filtr\u00f3."}], "id": "CVE-2026-42004", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "security@open-xchange.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42004", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-25T13:44:02.980438Z", "version": "2.0.3"}}]}, "published": "2026-06-25T13:16:40.547", "references": [{"source": "security@open-xchange.com", "url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html"}], "sourceIdentifier": "security@open-xchange.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-115"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

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