CVE-2026-0398

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor

State: Published
Severity: 5.3 Medium
Published: Feb 9, 2026
Updated: Feb 9, 2026
Reserved: Nov 28, 2025

Description

Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

Scores

CVSS	Score	Vector	Source
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L	OX

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
RecursorPowerDNS	5.3.0 to before 5.3.5Affected 5.2.0 to before 5.2.8Affected 5.1.0 to before 5.1.10Affected

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2026-01.html

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