CVE-2026-40208

Denial of service via DoH3 queries

Published Jun 25, 2026 CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Description
An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6367-1 dnsdist security update
History
Type Values Removed Values Added
First Time appeared Powerdns
Powerdns dnsdist
Vendors & Products Powerdns
Powerdns dnsdist
Type Values Removed Values Added
Weaknesses CWE-399
CWE-400
Type Values Removed Values Added
Weaknesses CWE-399
CWE-400
Type Values Removed Values Added
Weaknesses CWE-705
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description An attacker might be able to delay the processing of DoH3 queries by sending DoH3 GET queries with an invalid DATA frame.
Title Denial of service via DoH3 queries
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
OX
Published
Updated
Jun 25, 2026, 1:24 PM
Reserved
Apr 10, 2026, 7:11 AM
Status
Deferred
Published
Jun 25, 2026, 1:16 PM
Modified
Oct 25, 2026, 11:10 PM