CVE-2026-33254 — Resource exhaustion via DoQ/DoH3 connections

CVE-2026-33254

Resource exhaustion via DoQ/DoH3 connections PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
PowerDNS / DNSdist	affected 1.9.0 before 1.9.13; affected 2.0.0 before 2.0.4

CWE

No CWE identifiers supplied.

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.