CVE-2026-33595: Allocation of Resources Without Limits or Throttling in PowerDNS DNSdist
A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.
AI Analysis
Technical Summary
This vulnerability in PowerDNS DNSdist allows a remote attacker to trigger excessive memory allocation by repeatedly causing error responses over a single DNS-over-QUIC (DoQ) or DNS-over-HTTP/3 (DoH3) connection. The root cause is that certain resources are not freed until the connection terminates, enabling resource exhaustion. The CVSS 3.1 base score is 5.3 (medium), reflecting a network attack vector with no privileges or user interaction required, and impacts availability only. Affected versions include 1.9.0 and 2.0.0. No patch or vendor advisory is currently available to confirm remediation status.
Potential Impact
The vulnerability can cause denial of service conditions by exhausting memory resources on the DNSdist server, potentially degrading service availability. There is no impact on confidentiality or integrity reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting the number of simultaneous DoQ and DoH3 connections or implementing external rate limiting to reduce the risk of resource exhaustion.
CVE-2026-33595: Allocation of Resources Without Limits or Throttling in PowerDNS DNSdist
Description
A client can trigger excessive memory allocation by generating a lot of errors responses over a single DoQ and DoH3 connection, as some resources were not properly released until the end of the connection.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in PowerDNS DNSdist allows a remote attacker to trigger excessive memory allocation by repeatedly causing error responses over a single DNS-over-QUIC (DoQ) or DNS-over-HTTP/3 (DoH3) connection. The root cause is that certain resources are not freed until the connection terminates, enabling resource exhaustion. The CVSS 3.1 base score is 5.3 (medium), reflecting a network attack vector with no privileges or user interaction required, and impacts availability only. Affected versions include 1.9.0 and 2.0.0. No patch or vendor advisory is currently available to confirm remediation status.
Potential Impact
The vulnerability can cause denial of service conditions by exhausting memory resources on the DNSdist server, potentially degrading service availability. There is no impact on confidentiality or integrity reported. No known exploits are currently observed in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting the number of simultaneous DoQ and DoH3 connections or implementing external rate limiting to reduce the risk of resource exhaustion.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- OX
- Date Reserved
- 2026-03-23T12:57:56.814Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e8d83319fe3cd2cdbdac0d
Added to database: 4/22/2026, 2:16:19 PM
Last enriched: 4/22/2026, 2:32:21 PM
Last updated: 4/23/2026, 12:48:14 AM
Views: 4
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