Extra Validation Vulnerability in PowerDNS Recursor from PowerDNS
CVE-2026-42389

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
25 June 2026

What is CVE-2026-42389?

This vulnerability pertains to the PowerDNS Recursor version 5.4.x, which features enhanced security measures by implementing additional validation checks on responses received from authoritative DNS servers. This hardening aims to mitigate potential risks associated with improper handling of server responses, reinforcing the overall security posture of the DNS resolution process.

Affected Version(s)

Recursor 5.4.0 < 5.4.3

References

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

CVSS V3.1

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

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Xiang Li, Mingming Zhang, Fasheng Miao, Zuyao Xu from AOSP Lab, Nankai University, Zhongguancun Lab, Tsinghua University
.