CVE-2026-40209
Published:June 25, 2026
Updated:June 29, 2026
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.
Affected Packages
https://github.com/PowerDNS/pdns.git (GITHUB):
Affected version(s) >=dnsdist-1.9.0 <dnsdist-1.9.15Fix Suggestion:
Update to version dnsdist-1.9.15https://github.com/PowerDNS/pdns.git (GITHUB):
Affected version(s) >=dnsdist-2.0.0 <dnsdist-2.0.7Fix Suggestion:
Update to version dnsdist-2.0.7Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Missing Release of Resource after Effective Lifetime
EPSS
Base Score:
0.40