What is CVE-2026-33254?

CVE-2026-33254 is a medium-severity vulnerability in Powerdns Dnsdist, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-04-22.

How severe is CVE-2026-33254?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Resource exhaustion in Powerdns Dnsdist

CVE-2026-33254

An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.

EPSS: 0.004 (29.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security@open-xchange.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-33254?: CVE-2026-33254 is a medium-severity vulnerability in Powerdns Dnsdist, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 5.3/10. Published 2026-04-22.
How severe is CVE-2026-33254?: Medium severity. CVSS v3 base score is 5.3 out of 10.