What is CVE-2026-33594?

CVE-2026-33594 is a medium-severity vulnerability in Powerdns Dnsdist. CVSS score: 5.3/10. Published 2026-04-22.

How severe is CVE-2026-33594?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Powerdns Dnsdist

CVE-2026-33594

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.

EPSS: 0.000 (0.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

References

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

Frequently asked questions

What is CVE-2026-33594?: CVE-2026-33594 is a medium-severity vulnerability in Powerdns Dnsdist. CVSS score: 5.3/10. Published 2026-04-22.
How severe is CVE-2026-33594?: Medium severity. CVSS v3 base score is 5.3 out of 10.