CVE-2026-33254

MEDIUM 5.3

Resource exhaustion via DoQ/DoH3 connections

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	powerdns
Product	dnsdist
Published	Apr 22, 2026
Last Updated	Apr 22, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

PowerDNS / DNSdist

1.9.0 < 1.9.13 2.0.0 < 2.0.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Salvor Labs - https://salvor.fr