Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
Summary
| CVE | CVE-2026-0398 |
|---|---|
| State | PUBLISHED |
| Assigner | OX |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-02-09 15:16:11 UTC |
| Updated | 2026-04-20 14:55:46 UTC |
| Description | Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor. |
Risk And Classification
Primary CVSS: v3.1 5.3 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Problem Types: CWE-770 | Allocation of Resources Without Limits or Throttling | CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| 3.1 | CNA | CVSS | 5.3 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
LowCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-01.html | [email protected] | docs.powerdns.com | Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Yufan You from Tsinghua University (en)
CNA: TaoFei Guo from Peking University (en)
CNA: Yang Luo from Tsinghua University (en)
CNA: JianJun Chen from Tsinghua University (en)
There are currently no legacy QID mappings associated with this CVE.