CVE-2026-40211
Published:June 25, 2026
Updated:June 29, 2026
An attacker can send crafted DNS over HTTP/3 queries, triggering an exception that prevents some buffer from being freed right away. The buffer will be freed at the end of the QUIC connection, but on some setups it might be possible to open enough concurrent DoH3 streams to trigger an out-of-memory condition, resulting in a denial of service.
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)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.41