{"id":"CVE-2026-96405","title":"Aggregate DNS name chained pointer decompression work leads to degradation of service.","summary":"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 r…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cvssSource":"cna","cwe":["CWE-770"],"vendor":"NLnet Labs","product":"Unbound","affected":["Unbound < 1.26.2"],"published":"2026-10-21","updated":"2026-10-21","sourceUpdated":"2026-10-21T08:57:26.986Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-96405","references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-96405.txt"}],"tags":["cve.org"],"ingestedAt":"2026-10-21T09:46:15.398Z","slug":"CVE-2026-96405","body":"## Overview\n\nNLnet 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.\n\n## Affected\n\n- `Unbound < 1.26.2`\n\n## Remediation\n\nThis issue is fixed starting with version 1.26.2","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}