Home/CVE/A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH bac
CVE

CVE-2026-33594

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH bac

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.

MEDIUM · CVSS 5.3 EPSS 5e-05
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-770Allocation of Resources Without Limits or Throttling
▤

Affected Products & Versions

2
powerdns dnsdist>= 1.9.0 and < 1.9.13
powerdns dnsdist>= 2.0.0 and < 2.0.4
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · security@open-xchange.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Apr 2026 · 02:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
suse-csafopenSUSE-SU-2026:10632-1
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.htmlVendor Advisory
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