CVE-2026-33596 Details
Description
A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.
A denial-of-service vulnerability has been identified in PowerDNS DNSdist versions through 2.0.3 and 1.9.12. This issue arises when a client sends a flood of perfectly timed queries to a TCP-only or DNS over TLS backend, causing a mismatch between the queries sent and the responses received. As a result, the server may become overwhelmed, leading to service disruption.
Users can upgrade to PowerDNS DNSdist versions 1.9.13 or 2.0.4, where this vulnerability has been patched. Alternatively, do not route queries to TCP-only or DNS over TLS backends.
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
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| 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-190 | Integer Overflow or Wraparound | 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] |