CVE-2026-40622
Another 'ghost domain names' attack variant
02 Description
Another 'ghost domain names' attack variant
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.14% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 3.2% of scored records. A rank, not a probability.
- NVD base score
- 6.6 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
- NVD analysis status
- Analyzed. NVD last modified this record on 2026-07-24.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-05-20 09:18Z5 MO AGO
- Last updated
- 2026-05-20 12:12Z5 MO AGO
- Reserved
- 2026-05-07
- Assigning CNA
- NLnet Labs
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.6)
- CNA CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
- Weaknesses
- Data version
- 5.2
- Document digest
- 0113fb00f1f1509ee088446325f5d80a6505abb56146b5b68b6541bf90994177
05 Affected products
06 References
- www.nlnetlabs.nlhttps://www.nlnetlabs.nl/downloads/unbound/CVE-2026-40622.txt
07 Remediation
This issue is fixed starting with version 1.25.1
08 Fixed in
AlmaLinux 8
- python3-unbound Fixed in 1.16.2-5.12.el8_10
- unbound Fixed in 1.16.2-5.12.el8_10
- unbound-devel Fixed in 1.16.2-5.12.el8_10
- unbound-libs Fixed in 1.16.2-5.12.el8_10
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- python3-unbound Fixed in 1.24.2-3.el9_8.2
- unbound Fixed in 1.24.2-3.el9_8.2
- unbound-devel Fixed in 1.24.2-3.el9_8.2
- unbound-dracut Fixed in 1.24.2-3.el9_8.2
- unbound-libs Fixed in 1.24.2-3.el9_8.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 10
- python3-unbound Fixed in 1.24.2-7.el10_2.2
- unbound Fixed in 1.24.2-7.el10_2.2
- unbound-anchor Fixed in 1.24.2-7.el10_2.2
- unbound-devel Fixed in 1.24.2-7.el10_2.2
- unbound-dracut Fixed in 1.24.2-7.el10_2.2
- unbound-libs Fixed in 1.24.2-7.el10_2.2
- unbound-utils Fixed in 1.24.2-7.el10_2.2
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- python3-unbound Fixed in 1.16.2-5.12.el8_10
- unbound Fixed in 1.16.2-5.12.el8_10
- unbound-devel Fixed in 1.16.2-5.12.el8_10
- unbound-libs Fixed in 1.16.2-5.12.el8_10
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- python3-unbound Fixed in 1.24.2-3.el9_8.2
- unbound Fixed in 1.24.2-3.el9_8.2
- unbound-devel Fixed in 1.24.2-3.el9_8.2
- unbound-dracut Fixed in 1.24.2-3.el9_8.2
- unbound-libs Fixed in 1.24.2-3.el9_8.2
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 10
- python3-unbound Fixed in 1.24.2-7.el10_2.2
- unbound Fixed in 1.24.2-7.el10_2.2
- unbound-anchor Fixed in 1.24.2-7.el10_2.2
- unbound-devel Fixed in 1.24.2-7.el10_2.2
- unbound-dracut Fixed in 1.24.2-7.el10_2.2
- unbound-libs Fixed in 1.24.2-7.el10_2.2
- unbound-utils Fixed in 1.24.2-7.el10_2.2
Derived from AlmaLinux 10. Partial coverage: only packages taken from AlmaLinux 10 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- unbound No fix yet
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- unbound Fixed in 1.26.1-0+deb13u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- unbound Fixed in 1.25.2-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- unbound Fixed in 1.19.2-1ubuntu3.8
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 25.10
- unbound Fixed in 1.22.0-2ubuntu2.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 26.04 LTS
- unbound Fixed in 1.24.2-1ubuntu2.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- unbound No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.