{"id":"CVE-2026-97206","aliases":[],"cve":{"records":[{"id":"CVE-2026-97206","source":"NLnet Labs","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-14T09:16:14.090Z","published":"2026-10-21T08:57:41.106Z","modified":"2026-10-29T19:08:32.470Z"}],"publishers":[{"name":"NLnet Labs","role":"CNA","organizationId":"206fc3a0-e175-490b-9eaa-a5738056c9f6","modified":"2026-10-21T08:57:41.106Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-29T19:08:32.470Z"}],"references":[{"url":"https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt","tags":["vendor-advisory"],"source":"NLnet Labs"}],"weaknesses":[{"id":"CWE-416","description":"CWE-416: Use After Free","source":"NLnet Labs"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-29T19:08:11.587798Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.","titleSource":"NLnet Labs","descriptionSource":"NLnet Labs","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a crash.","score":7.5,"severity":"high","published":"2026-10-21T08:57:41.106Z","modified":"2026-10-29T19:08:32.470Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"NLnet Labs","name":"Unbound","platforms":[],"versions":[{"version":"1.22.0","status":"affected","lessThan":"1.26.2","versionType":"semver"}],"defaultStatus":"unaffected","cpes":[],"source":"NLnet Labs","url":"https://www.cve.org/CVERecord?id=CVE-2026-97206"}],"remediation":[{"text":"This issue is fixed starting with version 1.26.2","source":"NLnet Labs","url":"https://www.cve.org/CVERecord?id=CVE-2026-97206"}],"references":["https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-97206.txt"],"sources":[{"name":"CVE","id":"CVE-2026-97206","modified":"2026-10-29T19:08:32.470Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-97206"}],"assessments":[{"source":"NLnet Labs","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5}],"sourceAffected":[],"observedAt":"2026-10-29T19:29:54.865Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:55:30.737Z"},"coverage":[{"source":"NVD","status":"available","checkedAt":"2026-10-29T19:30:35.265Z","attemptedAt":"2026-10-29T19:30:35.265Z"},{"source":"GHSA","status":"available","checkedAt":"2026-10-29T19:30:35.045Z","attemptedAt":"2026-10-29T19:30:35.045Z"},{"source":"EUVD","status":"available","checkedAt":"2026-10-29T19:30:34.118Z","attemptedAt":"2026-10-29T19:30:34.118Z"},{"source":"EPSS","status":"available","checkedAt":"2026-10-29T19:30:33.720Z","attemptedAt":"2026-10-29T19:30:33.720Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-97206","url":"https://www.first.org/epss/","probability":0.00334,"percentile":0.2668,"date":"2026-10-29","checkedAt":"2026-10-29T19:30:33.720Z"},{"source":"ENISA EUVD","id":"EUVD-2026-107154","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-107154","modified":"Oct 21, 2026, 8:57:41 AM","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-10-29T19:30:34.118Z"},{"source":"GitHub Advisory Database","id":"GHSA-jc7q-6h55-rr57","url":"https://github.com/advisories/GHSA-jc7q-6h55-rr57","modified":"2026-10-21T09:30:35Z","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-10-29T19:30:35.045Z"},{"source":"NVD","id":"CVE-2026-97206","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97206","modified":"2026-10-29T19:17:29.807","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","checkedAt":"2026-10-29T19:30:35.265Z"}],"aiSummary":{"text":"NLnet Labs Unbound versions 1.22.0 to 1.26.1 have a use-after-free weakness, triggered by a remote DNS-over-QUIC client under multi-threaded operation, potentially leading to a crash. A client-triggered QUIC path migration can cause a stale pointer dereference. The issue is related to DNS-over-QUIC lifetime bugs.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T09:50:09.062Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-97206"}]}}