CVE-2026-33601 MEDIUM

CVE-2026-33601: Insufficient validation of zonemd record

Vendor Powerdns
Product Recursor
Published April 22, 2026
Last update April 22, 2026

CVSS base score

4.4/10
Attack vector Network
Attack complexity High
Privileges required High
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

Key dates

02Disclosure timeline

April 22, 2026 CVE published
April 22, 2026 Record updated