CVE-2026-33594 MEDIUM

CVE-2026-33594: Outgoing DoH excessive memory allocation

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

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.

Key dates

02Disclosure timeline

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