Description
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.
Published: 2026-04-22
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via memory exhaustion
Action: Apply Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DSA Debian DSA DSA-6235-1 dnsdist security update
History

Mon, 27 Apr 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*

Wed, 22 Apr 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Powerdns
Powerdns dnsdist
Vendors & Products Powerdns
Powerdns dnsdist

Wed, 22 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-770
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 22 Apr 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Resource exhaustion via DoQ/DoH3 connections
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}


Subscriptions

Powerdns Dnsdist
cve-icon MITRE

Status: PUBLISHED

Assigner: OX

Published:

Updated: 2026-04-22T14:51:51.130Z

Reserved: 2026-03-18T10:06:16.572Z

Link: CVE-2026-33254

cve-icon Vulnrichment

Updated: 2026-04-22T14:50:08.743Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-22T14:16:53.520

Modified: 2026-04-27T16:58:36.563

Link: CVE-2026-33254

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-22T19:30:24Z

Weaknesses