{"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"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Unbound", "vendor": "NLnet Labs", "versions": [{"lessThan": "1.26.2", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "sep@nlnetlabs.nl"}], "cveTags": [], "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."}], "id": "CVE-2026-96405", "lastModified": "2026-10-22T15:22:40.700", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "sep@nlnetlabs.nl", "type": "Secondary"}]}, "published": "2026-10-21T09:17:08.357", "references": [{"source": "sep@nlnetlabs.nl", "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-96405.txt"}], "sourceIdentifier": "sep@nlnetlabs.nl", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "sep@nlnetlabs.nl", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.26.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Unbound", "source": "cna", "vendor": "NLnet Labs"}, "product": "unbound", "vendor": "nlnetlabs"}], "created": "2026-10-21T16:30:06.673545+00:00", "updated": "2026-10-22T11:30:05.346459+00:00", "vendors": ["nlnetlabs", "nlnetlabs$PRODUCT$unbound"]}