Null Pointer Dereference in PowerDNS Due to Malicious Authoritative Server
CVE-2026-33600

4.4MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33600?

A security flaw in PowerDNS Recursor allows a malicious authoritative server to send a rogue Response Policy Zone (RPZ), resulting in a null pointer dereference. This occurs due to a missing consistency check, which can lead to a denial of service, ultimately disrupting the normal operation of the DNS service.

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
.