{"identifier":"CVE-2026-33594","cve":{"id":"CVE-2026-33594","description":"A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.","published":"2026-04-22T14:16:53.837000+00:00","modified":"2026-10-26T21:10:00.170000+00:00","status":"Analyzed","score":5.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvss_version":"3.1","affected":[{"criteria":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*","versionStartIncluding":"1.9.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"1.9.13"},{"criteria":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*","versionStartIncluding":"2.0.0","versionStartExcluding":"","versionEndIncluding":"","versionEndExcluding":"2.0.4"}],"weaknesses":["CWE-770"],"references":[{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html","source":"security@open-xchange.com","tags":["Vendor Advisory"]}],"kev":null,"kev_checked":true,"metrics":{"cvssMetricV31":[{"source":"security@open-xchange.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":3.9,"impactScore":1.4},{"source":"nvd@nist.gov","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}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-22T14:36:44.423277Z","id":"CVE-2026-33594","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*","versionStartIncluding":"1.9.0","versionEndExcluding":"1.9.13","matchCriteriaId":"DCC2DF11-EC5C-4112-90F2-C266CB65D390"},{"vulnerable":true,"criteria":"cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*","versionStartIncluding":"2.0.0","versionEndExcluding":"2.0.4","matchCriteriaId":"29865EC6-C1A0-40F3-B0BB-7F71F9C1DCB7"}]}]}],"source":"nvd","retrieved_at":"2026-10-28T10:19:31.683394+00:00","exploited":false,"kev_stale":false,"products":["powerdns / dnsdist"],"priority":{"label":"Assess exposure and vendor guidance","reasons":["No higher-priority signal is available in the current stored evidence."]},"epss":{"probability":0.00371,"percentile":0.30944,"date":"2026-10-28","stale":false},"version_assessment":null},"news":[],"campaigns":[],"domains":[{"domain":"www.dnsdist.org","source_url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html","investigate_url":"https://investigate.aeglixmind.com/#www.dnsdist.org"}],"arsenal_url":"https://arsenal.aeglixmind.com/?cve=CVE-2026-33594","catalog_url":"https://cves.aeglixmind.com/cve/CVE-2026-33594","research_url":"https://investigate.aeglixmind.com/research/cve/CVE-2026-33594","coverage":{"news_candidates_checked":0,"campaign_candidates_checked":0,"bounded":false,"notice":"Exact CVE mentions in stored public excerpts and reviewed campaign content only. A mention is not proof of exploitation, attribution or tool suitability. Missing matches do not establish absence."}}