CVE-2026-33254

Resource exhaustion via DoQ/DoH3 connections

CVSS 5.3 MEDIUMEPSS 0.4%CWE-770

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

PowerDNS · DNSdist

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References

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