{"api_version":"1","generated_at":"2026-10-23T05:22:04+00:00","cve":"CVE-2026-97206","urls":{"html":"https://cve.report/CVE-2026-97206","api":"https://cve.report/api/cve/CVE-2026-97206.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-97206","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-97206"},"summary":{"title":"DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.","description":"NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.","state":"PUBLISHED","assigner":"NLnet Labs","published_at":"2026-10-21 09:17:08","updated_at":"2026-10-22 15:22:40"},"problem_types":["CWE-416","CWE-416 CWE-416: Use After Free"],"metrics":[{"version":"3.1","source":"sep@nlnetlabs.nl","type":"Secondary","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","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","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","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt","name":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt","refsource":"sep@nlnetlabs.nl","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97206","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97206","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"NLnet Labs","product":"Unbound","version":"affected 1.22.0 1.26.2 semver","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-09-20T00:00:00.000Z","lang":"en","value":"Issue reported by Kunta Chu"},{"source":"CNA","time":"2026-09-29T00:00:00.000Z","lang":"en","value":"NLnet Labs shares patch"},{"source":"CNA","time":"2026-09-30T00:00:00.000Z","lang":"en","value":"Kunta Chu verifies patch"},{"source":"CNA","time":"2026-10-21T00:00:00.000Z","lang":"en","value":"Fixes released with version 1.26.2"}],"solutions":[{"source":"CNA","title":"","value":"This issue is fixed starting with version 1.26.2","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Kunta Chu (Tsinghua University)","lang":"en"},{"source":"CNA","value":"Jianjun Chen (Tsinghua University)","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"97206","cve":"CVE-2026-97206","epss":"0.002630000","percentile":"0.171060000","score_date":"2026-10-22","updated_at":"2026-10-23 00:07:30"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Unbound","vendor":"NLnet Labs","versions":[{"lessThan":"1.26.2","status":"affected","version":"1.22.0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"Kunta Chu (Tsinghua University)"},{"lang":"en","type":"finder","value":"Jianjun Chen (Tsinghua University)"}],"datePublic":"2026-10-21T00:00:00.000Z","descriptions":[{"lang":"en","value":"NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"compiled with DNS-over-QUIC support"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-10-21T08:57:41.106Z","orgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","shortName":"NLnet Labs"},"references":[{"tags":["vendor-advisory"],"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt"}],"solutions":[{"lang":"en","value":"This issue is fixed starting with version 1.26.2"}],"timeline":[{"lang":"en","time":"2026-09-20T00:00:00.000Z","value":"Issue reported by Kunta Chu"},{"lang":"en","time":"2026-09-29T00:00:00.000Z","value":"NLnet Labs shares patch"},{"lang":"en","time":"2026-09-30T00:00:00.000Z","value":"Kunta Chu verifies patch"},{"lang":"en","time":"2026-10-21T00:00:00.000Z","value":"Fixes released with version 1.26.2"}],"title":"DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.","x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","assignerShortName":"NLnet Labs","cveId":"CVE-2026-97206","datePublished":"2026-10-21T08:57:41.106Z","dateReserved":"2026-10-14T09:16:14.090Z","dateUpdated":"2026-10-21T08:57:41.106Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-21 09:17:08","lastModifiedDate":"2026-10-22 15:22:40","problem_types":["CWE-416","CWE-416 CWE-416: Use After Free"],"metrics":{"cvssMetricV31":[{"source":"sep@nlnetlabs.nl","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"97206","Ordinal":"1","Title":"DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on","CVE":"CVE-2026-97206","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"97206","Ordinal":"1","NoteData":"NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connection cleanup while a mesh reply still retains a pointer to the DoQ stream. Cleanup frees the DoQ stream and when the pending mesh reply later completes it dereferences a stale pointer leading to a crash.","Type":"Description","Title":"DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on"}]}}}