Invalid Zone Bypass in PowerDNS Recursor
CVE-2026-42390

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
25 June 2026

What is CVE-2026-42390?

An invalid zone may incorrectly pass ZONEMD validation checks in PowerDNS Recursor when ZoneToCache is set with ZONEMD validation mode enabled. This flaw could potentially be exploited in configurations relying on accurate validation for zone caching, compromising DNS integrity.

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

Vitaly Simonovich
.