Description
A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.
Published: 2026-04-22
Score: 5.3 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Memory Exhaustion Denial of Service
Action: Patch ASAP
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

Fri, 24 Apr 2026 17:00:00 +0000

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

Wed, 22 Apr 2026 20:15:00 +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 A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.
Title Outgoing DoH excessive memory allocation
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: 2026-04-22T14:36:48.875Z

Reserved: 2026-03-23T12:57:56.814Z

Link: CVE-2026-33594

cve-icon Vulnrichment

Updated: 2026-04-22T14:36:40.603Z

cve-icon NVD

Status : Analyzed

Published: 2026-04-22T14:16:53.837

Modified: 2026-04-24T16:48:39.007

Link: CVE-2026-33594

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-27T19:30:12Z

Weaknesses