Denial of Service Vulnerability in PowerDNS Recursor by PowerDNS
CVE-2026-33256

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Recursor
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33256?

A flaw exists in the PowerDNS Recursor where an attacker can exploit the internal web server to cause uncontrolled memory allocation. This can lead to a denial of service scenario, disrupting the normal operations of the server. Notably, the internal web server is disabled by default, but if activated, it can be targeted through specially crafted web requests.

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:
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

Ap4sh - Samy Medjahed and Ethicxz - Eliott Laurie Ap4sh / Ethicxz
.