CVE-2026-40208
Deferred Deferred - Pending Action

DoH3 GET Query Processing Delay via Invalid DATA Frame

Publication date: 2026-06-25

Last updated on: 2026-06-25

Assigner: Open-Xchange

Description
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

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Meta Information

Published
2026-06-25
Last Modified
2026-06-25
Generated
2026-07-15
AI Q&A
2026-06-25
EPSS Evaluated
2026-07-14
NVD
CVE-2026-40208
EUVD
EUVD-2026-39347

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
powerdns dnsdist to 2.0.6 (inc)
powerdns dnsdist 1.9.15
powerdns dnsdist 2.0.7

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-705 The product does not properly return control flow to the proper location after it has completed a task or detected an unusual condition.

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Executive Summary

This vulnerability involves an attacker potentially delaying the processing of DNS over HTTPS version 3 (DoH3) queries by sending DoH3 GET queries that contain an invalid DATA frame.

Impact Analysis

The impact of this vulnerability is a potential delay in the processing of DoH3 queries, which could lead to reduced availability or slower response times for DNS resolution over HTTPS.

Mitigation Strategies

The vulnerability involves delaying the processing of DoH3 queries by sending DoH3 GET queries with invalid DATA frames, which can lead to denial of service.

Since no specific mitigation steps or patches are mentioned in the provided context or resources, immediate steps should include monitoring for unusual DoH3 GET query traffic patterns and applying any available updates from the vendor once released.

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