Medium severity5.3NVD Advisory· Published Apr 22, 2026· Updated Apr 27, 2026

CVE-2026-33254

Description

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.

Affected products

PowerDNS/Dnsdist
cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*
Range: >=1.9.0,<1.9.13

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.htmlnvdVendor Advisory

News mentions

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cvss	0.345
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000