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.

Published 2026-04-22 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.008 (54.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.008 · change: +0.004

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html (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.