5.3

CVE-2026-40211

Denial of service via crafted DoH3 queries

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerPowerDNS
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Produkt DNSdist
Default Statusunaffected
Version 1.9.0
Version < 1.9.15
Status affected
Version 2.0.0
Version < 2.0.7
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.41% 0.33
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
security@open-xchange.com 5.3 3.9 1.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-770 Allocation of Resources Without Limits or Throttling

The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-09.html