CVE-2026-33599

Name: CVE-2026-33599
Creator: NVD / NIST
Published: 2026-04-22T14:16:54.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 0.28%

Last modified Jun 17, 2026

CVE-2026-33599 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.. EPSS estimates a 0.28% chance of exploitation in the next 30 days.

Description

A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

0.28%

20.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Powerdns	Dnsdist	>= 1.9.0, < 1.9.13
Powerdns	Dnsdist	>= 2.0.0, < 2.0.4

References

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.htmlVendor Advisory

Timeline

Published: Apr 22, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33599?

How severe is CVE-2026-33599?

CVE-2026-33599 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 0.28% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33599?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33599?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST