Medium severity · published Feb 9, 2026
CVE-2026-0398
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor
5.3
CVSS
0.3%
EPSS
No
On KEV
Description
Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
Recursor · PowerDNS
5.3.0 before 5.3.5; 5.2.0 before 5.2.8; 5.1.0 before 5.1.10 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0398
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0398
Vendor Advisory
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-01.html
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