CVE-2026-33254: An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in…
CVE-2026-33254 · Severity: medium · CVSS 5.3 · Published 2026-04-22
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-33254 being exploited in the wild.
How severe is CVE-2026-33254?
Medium severity, with a CVSS score of 5.3, published 22 April 2026.
Which products and versions are affected?
Powerdns Dnsdist. The advisory does not name versions.
Is there a fix for CVE-2026-33254?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-33254?
Check whether you run Powerdns Dnsdist. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.