Resource Usage and Cache Poisoning Vulnerability in PowerDNS Recursor
CVE-2026-0398

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
9 February 2026

What is CVE-2026-0398?

A vulnerability has been identified in the PowerDNS Recursor, where crafted zones can lead to increased resource consumption. Additionally, manipulated CNAME chains may result in cache poisoning, potentially affecting the integrity of DNS responses. This vulnerability emphasizes the importance of maintaining updated versions and implementing robust security measures to safeguard DNS infrastructure.

Affected Version(s)

Recursor 5.3.0 < 5.3.5

Recursor 5.2.0 < 5.2.8

Recursor 5.1.0 < 5.1.10

References

https://docs.powerdns.com/recursor/security-advisories/po...

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yufan You from Tsinghua University
TaoFei Guo from Peking University
Yang Luo from Tsinghua University
JianJun Chen from Tsinghua University
.