{"schemaVersion":3,"id":"CVE-2026-33595","aliases":["UBUNTU-CVE-2026-33595","DEBIAN-CVE-2026-33595"],"status":"published","duplicateOf":null,"title":null,"description":"A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.","dates":{"published":"2026-04-22T13:47:55.543Z","modified":"2026-04-22T14:40:28.647Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.5,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":10,"impact":6,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.5,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00801,"percentile":0.55909,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0.43,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.00371},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00801,"percentile":0.55909}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00371,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00801,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00801,"percentile":0.55909}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling","description":"The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/770.html"}],"affected":[{"vendor":"debian","product":"dnsdist","name":"dnsdist","label":"dnsdist","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/dnsdist","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 1.9.14-0+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.0.4-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 1.9.14-0+deb13u1 | < 2.0.4-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"dnsdist","name":"dnsdist","label":"dnsdist","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/dnsdist","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"powerdns","product":"dnsdist","name":"dnsdist","label":"dnsdist","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 1.9.0, < 1.9.13","noFixRecorded":false,"fixedIn":null},{"text":"≥ 2.0.0, < 2.0.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 1.9.0, < 1.9.13 | ≥ 2.0.0, < 2.0.4","eol":null,"hubHref":"/vendor/powerdns/dnsdist"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html","label":"www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html","hostname":"www.dnsdist.org","tags":["Vendor Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-33595","label":"ubuntu.com/security/CVE-2026-33595","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-33595","label":"www.cve.org/CVERecord?id=CVE-2026-33595","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html#cve-2026-33595-doq-doh3-excessive-memory-allocation","label":"www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html","hostname":"www.dnsdist.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-33595","label":"security-tracker.debian.org/tracker/CVE-2026-33595","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:10632-1","OPENSUSE-SU-2026:21015-1","SUSE-SU-2026:22319-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:10632-1","OPENSUSE-SU-2026:21015-1","SUSE-SU-2026:22319-1"]},"timeline":[{"kind":"published","date":"2026-04-22T13:47:55.543Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-22T14:40:28.647Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":30,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T13:02:12.372Z","stale":false,"partial":false}}