Resource exhaustion via DoQ/DoH3 connections (CVE-2026-33254)

Summary

Resource exhaustion via DoQ/DoH3 connections

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Fix status by distribution

Fixed packages published by each distribution for this CVE

Debian DEBIAN-CVE-2026-33254 dnsdist
Ubuntu UBUNTU-CVE-2026-33254 dnsdist

References

advisory github.com
advisory nvd.nist.gov
advisory dnsdist.org
package github.com
web repo.powerdns.com