Denial of Service Vulnerability in PowerDNS Recursor
CVE-2026-33601

4.4MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33601?

A vulnerability in the zoneToCache function of PowerDNS Recursor allows an attacker to exploit interactions with a malicious authoritative server. This flaw arises from a missing consistency check, which can trigger a null pointer dereference. Successful exploitation results in a denial of service, potentially disrupting DNS resolutions and impacting services relying on PowerDNS.

Affected Version(s)

Recursor 5.4.0 < 5.4.1

Recursor 5.3.0 < 5.3.6

Recursor 5.2.0 < 5.2.9

References

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

CVSS V3.1

Score:
4.4
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ylwango613
.