TCP-only and DNS over TLS Vulnerability in PowerDNS Backend
CVE-2026-33596

3.1LOW

Key Information:

Vendor

Powerdns

Status
Dnsdist
Vendor
CVE Published:
22 April 2026

What is CVE-2026-33596?

An identified vulnerability in PowerDNS's DNSdist allows clients to potentially create a mismatch between the queries they send and the responses received. By flooding the server with perfectly timed queries directed at a TCP-only or DNS over TLS backend, an attacker could exploit this flaw, leading to response inaccuracies that may compromise network integrity and reliability.

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:
3.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

ylwango613
.