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    "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": "2026-10-21T08:57:41.106Z"
    },
    "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"
            },
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}