CVE-2026-33596
Query Mismatch Vulnerability in Open-Xchange TCP/DNS Backends
Publication date: 2026-04-22
Last updated on: 2026-04-24
Assigner: Open-Xchange
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| powerdns | dnsdist | From 1.9.0 (inc) to 1.9.13 (exc) |
| powerdns | dnsdist | From 2.0.0 (inc) to 2.0.4 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-190 | The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability involves a client potentially causing a mismatch between queries sent to a backend and the responses received. This can happen if the client sends a flood of perfectly timed queries that are routed to a backend using either TCP-only or DNS over TLS.
How can this vulnerability impact me? :
The impact of this vulnerability is limited to availability, as indicated by the CVSS score. It could cause disruptions or delays in receiving correct responses from the backend due to mismatched queries and responses, potentially leading to degraded service or denial of service conditions.