CVE-2026-33595 Details
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.
A vulnerability in PowerDNS DNSdist versions prior to 1.9.13 and 2.0.4 allows clients to cause excessive memory allocation by generating numerous error responses over a single DoQ or DoH3 connection. This issue arises because certain resources are not properly released until the connection ends, leading to a denial-of-service condition.
Users can upgrade to PowerDNS DNSdist versions 1.9.13 or 2.0.4, or disable DoQ and DoH3, which are disabled by default.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Apr 22, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-770 | Allocation of Resources Without Limits or Throttling | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| powerdns dnsdist | >= 1.9.0, < 1.9.13 >= 2.0.0, < 2.0.4 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 24, 2026 | Initial Analysis | [email protected] |
| Apr 22, 2026 | CVE Modified | CISA-ADP |
| Apr 22, 2026 | New CVE Received | [email protected] |