{"id":"CVE-2026-97206","revision":"95c9044170e24d36aaf516784e9d5ef2","records":[{"revision":"95c9044170e24d36aaf516784e9d5ef2","observedAt":"2026-10-29T21:14:49.558+00:00","statement":{"source":"cve-program","id":"CVE-2026-97206","aliases":[],"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":0,"publishedAt":"2026-10-21T08:57:41.106+00:00","modifiedAt":"2026-10-29T19:08:32.47+00:00","affected":[{"ecosystem":"Vendor product","name":"Unbound","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"NLnet Labs\",\n                    \"product\": \"Unbound\",\n                    \"versions\": [\n                        {\n                            \"version\": \"1.22.0\",\n                            \"status\": \"affected\",\n                            \"lessThan\": \"1.26.2\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-97206","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-97206","identifiers":["CVE-2026-97206"]},"retained":false,"historicalAffected":[]}],"coverage":[]}