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.

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.

dnsdist-2.0.7-1.1 on GA media

Security update for dnsdist

Affected: Ubuntu:16.04:LTS: dnsdist, Ubuntu:Pro:18.04:LTS: dnsdist, Ubuntu:Pro:20.04:LTS: dnsdist, Ubuntu:Pro:22.04:LTS: dnsdist, Ubuntu:Pro:24.04:LTS: dnsdist, Ubuntu:25.10: dnsdist, Ubuntu:26.04:LTS: dnsdist

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.

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in PowerDNS ausnutzen, um Denial-of-Service-Zustände herbeizuführen, DNS-Caches zu manipulieren, Sicherheitsprüfungen zu umgehen, vertrauliche Informationen offenzulegen, DNSSEC-Validierungen zu beeinträchtigen oder die Integrität und Verfügbarkeit der DNS-Auflösung zu beeinflussen.