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CVE-2026-40209

MEDIUM
5.3
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-40209
State
PUBLISHED
Assigner
OX
Reserved
2026-04-10 07:11 UTC
Published
2026-06-25 12:23 UTC
Last updated
2026-06-25 13:56 UTC
Primary CWE
CWE-772
CWE-772 Missing Release of Resource after Effective Lifetime
Vendor / Product
PowerDNS / DNSdist
Sources
cve.org  ·  NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
PowerDNS DNSdist — 1.9.0 < 1.9.15, 2.0.0 < 2.0.7
Weakness (CWE)
CWESourceDescription
— cna Missing Release of Resource after Effective Lifetime
CWE-772 adp CWE-772 Missing Release of Resource after Effective Lifetime
CVSS scores (1)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
References (1)
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