{"schemaVersion":3,"id":"CVE-2026-96405","aliases":["DEBIAN-CVE-2026-96405"],"status":"published","duplicateOf":null,"title":null,"description":"NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message results in a lot of CPU usage following them. A malicious actor with recursive-query access and control of an ordinarily delegated authority that serves specially crafted replies can exploit the vulnerability and degrade Unbound's general performance.","dates":{"published":"2026-10-21T08:57:26.986Z","modified":"2026-10-21T08:57:26.986Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","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":"NVD","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}]},"epss":{"probability":0.00238,"percentile":0.13946,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-21T00:00:00.000Z","score":0.00238,"percentile":0.13946}],"last30":[{"date":"2026-10-21T00:00:00.000Z","score":0.00238,"percentile":0.13946}]},"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":"unbound","name":"unbound","label":"unbound","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/unbound","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"nlnet labs","product":"unbound","name":"Unbound","label":"unbound","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 1.26.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 1.26.2","eol":null,"hubHref":"/vendor/nlnet_labs/unbound"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-96405.txt","label":"www.nlnetlabs.nl/downloads/unbound/CVE-2026-96405.txt","hostname":"www.nlnetlabs.nl","tags":["Vendor Advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-96405","label":"security-tracker.debian.org/tracker/CVE-2026-96405","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-21T08:57:26.986Z","label":"Published","detail":"Vulnerability first disclosed.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T09:23:42.095Z","stale":false,"partial":false}}