CVE-2026-33254

EUVD-2026-24927
An attacker can create a large number of concurrent DoQ or DoH3 connections, causing unlimited memory allocation in DNSdist and leading to a denial of service. DOQ and DoH3 are disabled by default.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
OXCNA
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
powerdnsdnsdist
1.9.0 ≤
𝑥
< 1.9.13
CNA
powerdnsdnsdist
2.0.0 ≤
𝑥
< 2.0.4
CNA
Debian logo
Debian Releases
Debian Product
Codename
dnsdist
bookworm
vulnerable
bullseye
vulnerable
forky
vulnerable
sid
2.0.4-1
fixed
trixie
vulnerable
Common Weakness Enumeration
References
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html