CVE-2026-40209

CVSS Score & Metrics

Base Score

5.3 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L                                    

Vulnerability 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.

Vulnerability Details

Published Date

June 25, 2026

Last Modified

June 25, 2026

CWE ID

CWE-772

Source

NVD

Vendor

PowerDNS

Product

DNSdist

External References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html

CVSS Score & Metrics

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