{"id":"CVE-2026-52684","state":"PUBLISHED","title":"Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack","description":"If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the \nchild records are used immediately if not expired and thus valid, or the\n records are expired, and in that case not used.  So this case \ncan only happen if almost expired records are used to refresh the \nauthoritative NS records.","publishedAt":"2026-07-23T07:49:04.336Z","updatedAt":"2026-07-23T14:00:17.742Z","severity":{"score":3.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"OX"},"assigner":"OX","products":["PowerDNS Recursor"],"affected":[{"vendor":"PowerDNS","product":"Recursor","packageName":"pdns-recursor","defaultStatus":"unaffected","versions":[{"version":"0.0.0","status":"affected","lessThan":"5.5.0","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","repo":"https://github.com/PowerDNS/pdns","modules":["Packet cache","Record cache"],"programFiles":["rec-packetcache.cc","recursor_cache.cc"]}],"references":["https://github.com/PowerDNS/pdns/pull/17748"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/52xxx/CVE-2026-52684.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-52684","state":"PUBLISHED","datePublished":"2026-07-23T07:49:04.336Z","dateUpdated":"2026-07-23T14:00:17.742Z","assignerShortName":"OX","assignerOrgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateReserved":"2026-06-08T08:05:31.707Z"},"containers":{"cna":{"title":"Prefetch Feature Allows Persistent Ghost Domain Cache Poisoning Attack","descriptions":[{"lang":"en","value":"If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for lack of data. This does not happen on regular resolve as then then the \nchild records are used immediately if not expired and thus valid, or the\n records are expired, and in that case not used.  So this case \ncan only happen if almost expired records are used to refresh the \nauthoritative NS records."}],"affected":[{"vendor":"PowerDNS","product":"Recursor","packageName":"pdns-recursor","defaultStatus":"unaffected","versions":[{"version":"0.0.0","status":"affected","lessThan":"5.5.0","versionType":"semver"}],"collectionURL":"https://repo.powerdns.com/","repo":"https://github.com/PowerDNS/pdns","modules":["Packet cache","Record cache"],"programFiles":["rec-packetcache.cc","recursor_cache.cc"]}],"references":[{"url":"https://github.com/PowerDNS/pdns/pull/17748"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"LOW","baseScore":3.7,"vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"}}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","type":"CWE"}]}],"providerMetadata":{"shortName":"OX","orgId":"8ce71d90-2354-404b-a86e-bec2cc4e6981","dateUpdated":"2026-07-23T07:49:04.336Z"},"datePublic":"2026-07-19T22:00:00.000Z","credits":[{"lang":"en","value":"Taofei Guo, Peking University. Qi Wang and JianJun Chen and Haixin Duan, Tsinghua University.","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.4"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-23T14:00:08.322568Z","id":"CVE-2026-52684","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-23T14:00:17.742Z"}}]}}}