What is CVE-2026-33599?

CVE-2026-33599 is a low-severity vulnerability in Powerdns Dnsdist, classified under Out-of-bounds Read. CVSS score: 3.1/10. Published 2026-04-22.

How severe is CVE-2026-33599?

Low severity. CVSS v3 base score is 3.1 out of 10.

Out-of-bounds Read in Powerdns Dnsdist

CVE-2026-33599

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.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (20.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

security@open-xchange.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-33599?: CVE-2026-33599 is a low-severity vulnerability in Powerdns Dnsdist, classified under Out-of-bounds Read. CVSS score: 3.1/10. Published 2026-04-22.
How severe is CVE-2026-33599?: Low severity. CVSS v3 base score is 3.1 out of 10.