{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-96405","assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","state":"PUBLISHED","assignerShortName":"NLnet Labs","dateReserved":"2026-10-14T09:16:14.093Z","datePublished":"2026-10-21T08:57:26.986Z","dateUpdated":"2026-10-21T08:57:26.986Z"},"containers":{"cna":{"title":"Aggregate DNS name chained pointer decompression work leads to degradation of service.","datePublic":"2026-10-21T00:00:00.000Z","affected":[{"vendor":"NLnet Labs","product":"Unbound","versions":[{"version":"0","status":"affected","lessThan":"1.26.2","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"lang":"en","value":"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."}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}}],"problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"solutions":[{"lang":"en","value":"This issue is fixed starting with version 1.26.2"}],"timeline":[{"time":"2026-07-16T00:00:00.000Z","lang":"en","value":"Issue reported by Yuheng Zhang"},{"time":"2026-07-17T00:00:00.000Z","lang":"en","value":"NLnet Labs shares patch"},{"time":"2026-07-17T00:00:00.000Z","lang":"en","value":"Yuheng Zhang requests changes"},{"time":"2026-07-21T00:00:00.000Z","lang":"en","value":"NLnet Labs shares new patch"},{"time":"2026-09-30T00:00:00.000Z","lang":"en","value":"Yuheng Zhang verifies patch"},{"time":"2026-09-16T00:00:00.000Z","lang":"en","value":"Coordinated fixes released with version 1.26.2"}],"credits":[{"lang":"en","value":"Yuheng Zhang (Tsinghua University & Jingxian Technology Co., Ltd.)","type":"finder"},{"lang":"en","value":"Jianjun Chen (Tsinghua University)","type":"finder"},{"lang":"en","value":"Zihan Wang (Z.AI Co., Ltd.)","type":"finder"},{"lang":"en","value":"Kaiwen Shen (CloudItera)","type":"finder"}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-96405.txt","tags":["vendor-advisory"]}],"providerMetadata":{"orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","shortName":"NLnet Labs","dateUpdated":"2026-10-21T08:57:26.986Z"},"x_generator":{"engine":"cvelib 1.8.0"}}}}