CVE-2026-33602 MEDIUM

CVE-2026-33602: Off-by-one access when processing crafted UDP responses

Vendor Powerdns
Product DNSdist
Published April 22, 2026
Last update April 22, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.

Key dates

02Disclosure timeline

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