CVE-2026-40211
Fixed in a distro release EPSS <1%CVSS 5.3
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.
Products: powerdns dnsdist
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | dnsdist | no fix |
| Debian 13 | dnsdist | 1.9.15-0+deb13u1 |
| Debian 14 | dnsdist | 2.1.0-1 |
| SUSE Linux Enterprise Server 16.0 | dnsdist | 1.9.15-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | dnsdist | 1.9.15-160000.1.1 |
| Ubuntu 16.04 LTS | dnsdist | no fix |
| Ubuntu 25.10 | dnsdist | no fix |
| Ubuntu 26.04 LTS | dnsdist | no fix |
| Ubuntu 26.10 | dnsdist | no fix |
| Ubuntu Pro 18.04 LTS | dnsdist | no fix |
| Ubuntu Pro 20.04 LTS | dnsdist | no fix |
| Ubuntu Pro 22.04 LTS | dnsdist | no fix |
| Ubuntu Pro 24.04 LTS | dnsdist | no fix |
| openSUSE Leap 16.0 | dnsdist | 1.9.15-160000.1.1 |
| openSUSE Tumbleweed | dnsdist | 2.0.7-1.1 |