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URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40209

⇱ NVD - CVE-2026-40209

  1. Vulnerabilities

CVE-2026-40209 Detail

Not Scheduled

This CVE record is not being prioritized for NVD enrichment efforts due to resource or other concerns.

Description

An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html Open-Xchange

Weakness Enumeration

CWE-ID CWE Name Source
CWE-772 Missing Release of Resource after Effective Lifetime CISA-ADP  

Change History

2 change records found show changes

CVE Modified by CISA-ADP 6/25/2026 11:16:35 AM

Action Type Old Value New Value
Added CWE 
CWE-772
Added SSVC 
{"timestamp":"2026-06-25T13:56:17.791790Z","id":"CVE-2026-40209","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

New CVE Received from Open-Xchange 6/25/2026 9:16:39 AM

Action Type Old Value New Value
Added Description 
An attacker might be able to cause outgoing TCP connections to backend to be stuck until a timeout occurs instead of being released immediately, by sending IXFR queries. This could be used to cause a denial of service if there is a limit to the number of concurrent connections to this backend, or if the process runs out of file descriptors.
Added CVSS V3.1 
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Added Reference 
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html
Added Affected 
[{"vendor":"PowerDNS","product":"DNSdist","defaultStatus":"unaffected","collectionURL":"https://repo.powerdns.com/","packageName":"dnsdist","modules":["DNS over TCP to the backend"],"programFiles":["dnsdist-tcp-downstream.cc"],"repo":"https://github.com/PowerDNS/pdns","versions":[{"version":"1.9.0","lessThan":"1.9.15","versionType":"semver","status":"affected"},{"version":"2.0.0","lessThan":"2.0.7","versionType":"semver","status":"affected"}]}]

Quick Info

CVE Dictionary Entry:
CVE-2026-40209
NVD Published Date:
06/25/2026
NVD Last Modified:
06/25/2026
Source:
Open-Xchange