{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97206", "assignerOrgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "state": "PUBLISHED", "assignerShortName": "NLnet Labs", "dateReserved": "2026-10-14T09:16:14.090Z", "datePublished": "2026-10-21T08:57:41.106Z", "dateUpdated": "2026-10-29T19:08:32.470Z" }, "containers": { "cna": { "title": "DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.", "datePublic": "2026-10-21T00:00:00.000Z", "affected": [ { "vendor": "NLnet Labs", "product": "Unbound", "versions": [ { "version": "1.22.0", "status": "affected", "lessThan": "1.26.2", "versionType": "semver" } ], "defaultStatus": "unaffected" } ], "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": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "compiled with DNS-over-QUIC support" } ], "cvssV3_1": { "version": "3.1", "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" } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-416", "description": "CWE-416: Use After Free", "type": "CWE" } ] } ], "solutions": [ { "lang": "en", "value": "This issue is fixed starting with version 1.26.2" } ], "timeline": [ { "time": "2026-09-20T00:00:00.000Z", "lang": "en", "value": "Issue reported by Kunta Chu" }, { "time": "2026-09-29T00:00:00.000Z", "lang": "en", "value": "NLnet Labs shares patch" }, { "time": "2026-09-30T00:00:00.000Z", "lang": "en", "value": "Kunta Chu verifies patch" }, { "time": "2026-10-21T00:00:00.000Z", "lang": "en", "value": "Fixes released with version 1.26.2" } ], "credits": [ { "lang": "en", "value": "Kunta Chu (Tsinghua University)", "type": "finder" }, { "lang": "en", "value": "Jianjun Chen (Tsinghua University)", "type": "finder" } ], "references": [ { "url": "https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt", "tags": [ "vendor-advisory" ] } ], "providerMetadata": { "orgId": "206fc3a0-e175-490b-9eaa-a5738056c9f6", "shortName": "NLnet Labs", "dateUpdated": "2026-10-21T08:57:41.106Z" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-10-29T19:08:11.587798Z", "id": "CVE-2026-97206", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-29T19:08:32.470Z" } } ] } }