CVE-2026-33596 LOW

CVE-2026-33596: TCP backend stream ID overflow

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

CVSS base score

3.1/10
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.

Key dates

02Disclosure timeline

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