Denial of Service Vulnerability in DNSdist by PowerDNS
CVE-2026-33254

5.3MEDIUM

Key Information:

Vendor

Powerdns

Status
Dnsdist
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33254?

A vulnerability in DNSdist allows attackers to exploit its handling of DoQ and DoH3 connections. By initiating a large number of concurrent connections, an attacker can trigger excessive memory allocation, ultimately resulting in a denial of service. Notably, the DoQ and DoH3 protocols are disabled by default, reducing exposure unless actively enabled.

Affected Version(s)

DNSdist 1.9.0 < 1.9.13

DNSdist 2.0.0 < 2.0.4

References

https://www.dnsdist.org/security-advisories/powerdns-advi...

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

Salvor Labs - https://salvor.fr
.