CVE catalog

CVE-2026-97206

unbound affected and fixed versions

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.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Oct 21, 2026, 9:17:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.33% · Oct 27, 2026

Projects and upstream resources

[unbound][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "unbound",
      "status": "fixed",
      "release": "sid",
      "version": "1.26.2-1"
    },
    {
      "name": "unbound",
      "status": "fixed",
      "release": "forky",
      "version": "1.26.2-1"
    },
    {
      "name": "unbound",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1.22.0-2+deb13u3"
    },
    {
      "name": "unbound",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1.26.2-0+deb13u1"
    },
    {
      "name": "unbound",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1.17.1-2+deb12u4"
    },
    {
      "name": "unbound",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "1.17.1-2+deb12u3"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "unbound",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1.26.2-1"
    },
    {
      "bug": null,
      "name": "unbound",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1.26.2-1"
    },
    {
      "bug": null,
      "name": "unbound",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1.26.2-0+deb13u1"
    },
    {
      "bug": null,
      "name": "unbound",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "unbound",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1.9.0-2ubuntu1",
        "1.9.0-2ubuntu2",
        "1.9.4-2",
        "1.9.4-2ubuntu1",
        "1.9.4-2ubuntu1.1",
        "1.9.4-2ubuntu1.2",
        "1.9.4-2ubuntu1.3",
        "1.9.4-2ubuntu1.4",
        "1.9.4-2ubuntu1.5",
        "1.9.4-2ubuntu1.6",
        "1.9.4-2ubuntu1.8",
        "1.9.4-2ubuntu1.9",
        "1.9.4-2ubuntu1.11",
        "1.9.4-2ubuntu1.11+esm1",
        "1.9.4-2ubuntu1.11+esm2",
        "1.9.4-2ubuntu1.11+esm3"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-97206"
    },
    {
      "name": "unbound",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "1.13.1-1ubuntu1",
        "1.13.1-1ubuntu3",
        "1.13.1-1ubuntu5",
        "1.13.1-1ubuntu5.1",
        "1.13.1-1ubuntu5.2",
        "1.13.1-1ubuntu5.3",
        "1.13.1-1ubuntu5.4",
        "1.13.1-1ubuntu5.5",
        "1.13.1-1ubuntu5.7",
        "1.13.1-1ubuntu5.8",
        "1.13.1-1ubuntu5.10",
        "1.13.1-1ubuntu5.11",
        "1.13.1-1ubuntu5.12",
        "1.13.1-1ubuntu5.13",
        "1.13.1-1ubuntu5.14",
        "1.13.1-1ubuntu5.15",
        "1.13.1-1ubuntu5.16",
        "1.13.1-1ubuntu5.17"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-97206"
    },
    {
      "name": "unbound",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "1.17.1-2",
        "1.18.0-2ubuntu1",
        "1.18.0-2ubuntu2",
        "1.19.1-1ubuntu1",
        "1.19.2-1ubuntu1",
        "1.19.2-1ubuntu3",
        "1.19.2-1ubuntu3.1",
        "1.19.2-1ubuntu3.2",
        "1.19.2-1ubuntu3.3",
        "1.19.2-1ubuntu3.4",
        "1.19.2-1ubuntu3.5",
        "1.19.2-1ubuntu3.6",
        "1.19.2-1ubuntu3.7",
        "1.19.2-1ubuntu3.8",
        "1.19.2-1ubuntu3.9",
        "1.19.2-1ubuntu3.10",
        "1.19.2-1ubuntu3.12"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-97206"
    },
    {
      "name": "unbound",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.10",
      "versions": [
        "1.24.2-1ubuntu2",
        "1.25.1-1ubuntu1",
        "1.25.1-1ubuntu3"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-97206"
    },
    {
      "name": "unbound",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "1.22.0-2ubuntu2",
        "1.22.0-2ubuntu4",
        "1.24.2-1ubuntu1",
        "1.24.2-1ubuntu2",
        "1.24.2-1ubuntu2.1",
        "1.24.2-1ubuntu2.2",
        "1.24.2-1ubuntu2.3",
        "1.24.2-1ubuntu2.4"
      ],
      "ecosystem": "deb",
      "fixed_version": "",
      "provider_record_id": "UBUNTU-CVE-2026-97206"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libunbound8]Unknown
Source package: [unbound]
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
[libunbound-dev]Unknown
Source package: [unbound]
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
[python3-unbound]Unknown
Source package: [unbound]
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
[unbound]Unknown
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
[unbound-anchor]Unknown
Source package: [unbound]
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
[unbound-host]Unknown
Source package: [unbound]
Details (4)
- 1.17.1-2+deb12u4 · amd64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u4 · arm64 · bookworm
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · amd64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12
- 1.17.1-2+deb12u3 · arm64 · bookworm-security
  Affected
  dsa · unbound · debian · bookworm; dsa · unbound · debian · 12

[Debian 13 (Trixie)]

[libunbound8]Unknown
Source package: [unbound]
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
[libunbound-dev]Unknown
Source package: [unbound]
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
[python3-unbound]Unknown
Source package: [unbound]
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
[unbound]Unknown
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
[unbound-anchor]Unknown
Source package: [unbound]
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
[unbound-host]Unknown
Source package: [unbound]
Details (6)
- 1.22.0-2+deb13u3 · amd64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.22.0-2+deb13u3 · arm64 · trixie-security
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version
  Affected · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13
- 1.26.2-0+deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1.26.2-0+deb13u1
  dsa · unbound · debian · 13

Observed: Oct 27, 2026, 4:08:10 AM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]