CVE catalog

CVE-2026-40622

NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of attacks that could extend the ghost domain window by up to one cached TTL configu

[CVE catalog]

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published
Source
[NVD] · [CVE record]
EPSS
0.14% · Oct 25, 2026

NLnet Labs Unbound 1.16.2 up to and including version 1.25.0 has a vulnerability of the 'ghost domain names' family of attacks that could extend the ghost domain window by up to one cached TTL configured value. Similar to other 'ghost domain names' attacks, an adversary needs to control a (ghost) zone and be able to query a vulnerable Unbound. A single client NS query can cause Unbound to overwrite the cached expired parent-side referral NS rrset with the child-side apex NS rrset and essentially extend the ghost domain window by up to one cached TTL configured value ('cache-max-ttl'). In configurations where 'harden-referral-path: yes' is used (non-default configuration), no client NS query is required since Unbound implicitly performs that query. Unbound 1.25.1 contains a patch with a fix that does not allow extension of TTLs for (parent) NS records regardless of their trust.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianunboundsid1.26.2-1fixed
Debianunboundforky1.26.2-1fixed
Debianunboundtrixie1.22.0-2+deb13u3vulnerable
Debianunboundtrixie-security1.26.2-0+deb13u1fixed
Debianunboundbookworm1.17.1-2+deb12u4vulnerable
Debianunboundbookworm-security1.17.1-2+deb12u3vulnerable
CpeunboundNot reported1.19.2-1ubuntu3.8fixed
Cpelibunbound-devNot reported1.19.2-1ubuntu3.8fixed
Cpelibunbound8Not reported1.19.2-1ubuntu3.8fixed
Cpepython3-unboundNot reported1.19.2-1ubuntu3.8fixed
Cpeunbound-anchorNot reported1.19.2-1ubuntu3.8fixed
Cpeunbound-hostNot reported1.19.2-1ubuntu3.8fixed
CpeunboundNot reportedNot reportedvulnerable
CpeunboundNot reported1.25.1fixed
Ubuntuunboundpro1.4.22-1ubuntu6vulnerable
Ubuntuunboundpro1.5.7-1ubuntu1vulnerable
Ubuntuunboundpro1.5.7-1ubuntu2vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1+esm1vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1+esm2vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1+esm3vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1+esm4vulnerable
Ubuntuunboundpro1.5.8-1ubuntu1.1+esm5vulnerable
Ubuntuunbound24.041.17.1-2vulnerable
Ubuntuunbound24.041.18.0-2ubuntu1vulnerable
Ubuntuunbound24.041.18.0-2ubuntu2vulnerable
Ubuntuunbound24.041.19.1-1ubuntu1vulnerable
Ubuntuunbound24.041.19.2-1ubuntu1vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.1vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.2vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.3vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.4vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.5vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.6vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.7vulnerable
Ubuntuunbound24.041.19.2-1ubuntu3.8fixed
Ubuntuunbound25.101.22.0-1ubuntu1vulnerable
Ubuntuunbound25.101.22.0-2ubuntu1vulnerable
Ubuntuunbound25.101.22.0-2ubuntu2vulnerable
Ubuntuunbound25.101.22.0-2ubuntu2.1vulnerable
Ubuntuunbound25.101.22.0-2ubuntu2.2vulnerable
Ubuntuunbound25.101.22.0-2ubuntu2.3fixed
Ubuntuunbound26.041.22.0-2ubuntu2vulnerable
Ubuntuunbound26.041.22.0-2ubuntu4vulnerable
Ubuntuunbound26.041.24.2-1ubuntu1vulnerable
Ubuntuunbound26.041.24.2-1ubuntu2vulnerable
Ubuntuunbound26.041.24.2-1ubuntu2.1fixed
Alpineunbound3.221.25.2-r0fixed
Alpineunbound3.231.25.2-r0fixed
Alpineunbound3.241.25.1-r0fixed
Suseunboundlinux enterprise module for basesystem 15 sp71.25.2-150600.23.19.1fixed
Suseunboundlinux enterprise module for package hub 15 sp71.25.2-150600.23.19.1fixed
Suseunboundlinux enterprise server 15 sp6-ltss1.25.2-150600.23.19.1fixed
Suseunboundlinux enterprise server for sap applications 15 sp61.25.2-150600.23.19.1fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianunboundsourcesid1.25.2-1not yet assignedNot reported[1137187]
Debianunboundsourceforky1.25.2-1not yet assignedNot reported[1137187]
Debianunboundsourcetrixie1.26.1-0+deb13u1not yet assignedNot reported[1137187]
Debianunboundsourcebookworm(unfixed)not yet assignedNot reported[1137187]
CpeunboundcpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
Cpelibunbound-devcpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
Cpelibunbound8cpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
Cpepython3-unboundcpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
Cpeunbound-anchorcpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
Cpeunbound-hostcpeNot reported1.19.2-1ubuntu3.8Not reportedNot reportedNot reported
CpeunboundcpeNot reported1.25.1Not reportedNot reportedNot reported
Ubuntuunbounddeb24.041.19.2-1ubuntu3.8Not reportedUBUNTU-CVE-2026-40622Not reported
Ubuntuunbounddeb25.101.22.0-2ubuntu2.3Not reportedUBUNTU-CVE-2026-40622Not reported
Ubuntuunbounddeb26.041.24.2-1ubuntu2.1Not reportedUBUNTU-CVE-2026-40622Not reported
Alpineunboundapk3.221.25.2-r0Not reportedALPINE-CVE-2026-40622Not reported
Alpineunboundapk3.231.25.2-r0Not reportedALPINE-CVE-2026-40622Not reported
Alpineunboundapk3.241.25.1-r0Not reportedALPINE-CVE-2026-40622Not reported
Suseunboundrpmlinux enterprise module for basesystem 15 sp71.25.2-150600.23.19.1Not reportedSUSE-SU-2026:3885-1Not reported
Suseunboundrpmlinux enterprise module for package hub 15 sp71.25.2-150600.23.19.1Not reportedSUSE-SU-2026:3885-1Not reported
Suseunboundrpmlinux enterprise server 15 sp6-ltss1.25.2-150600.23.19.1Not reportedSUSE-SU-2026:3885-1Not reported
Suseunboundrpmlinux enterprise server for sap applications 15 sp61.25.2-150600.23.19.1Not reportedSUSE-SU-2026:3885-1Not reported

[Debian bug #1137187]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libunbound8]Affected

    Source package: [unbound]

    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

  • [libunbound-dev]Affected

    Source package: [unbound]

    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

  • [python3-unbound]Affected

    Source package: [unbound]

    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

  • [unbound]Affected
    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

  • [unbound-anchor]Affected

    Source package: [unbound]

    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

  • [unbound-host]Affected

    Source package: [unbound]

    Details (4)

    • 1.17.1-2+deb12u4 · amd64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u4 · arm64 · bookworm

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · amd64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

    • 1.17.1-2+deb12u3 · arm64 · bookworm-security

      Affected

      nvd · unbound · debian · bookworm; nvd · unbound · debian · 12

[Debian 13 (Trixie)]

  • [libunbound8]Affected

    Source package: [unbound]

    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

  • [libunbound-dev]Affected

    Source package: [unbound]

    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

  • [python3-unbound]Affected

    Source package: [unbound]

    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

  • [unbound]Affected
    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

  • [unbound-anchor]Affected

    Source package: [unbound]

    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

  • [unbound-host]Affected

    Source package: [unbound]

    Details (6)

    • 1.22.0-2+deb13u3 · amd64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · amd64 · trixie-security · Historical version

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.22.0-2+deb13u3 · arm64 · trixie-security

      Affected · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.1-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

    • 1.26.2-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 1.26.1-0+deb13u1

      nvd · unbound · debian · 13

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]