What is CVE-2026-33602?

CVE-2026-33602 is a medium-severity vulnerability in Powerdns Dnsdist, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-04-22.

How severe is CVE-2026-33602?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Powerdns Dnsdist

CVE-2026-33602

A rogue backend can send a crafted UDP response with a query ID off by one related to the maximum configured value, triggering an out-of-bounds write leading to a denial of service.

Vulnerability class: Buffer Overflow

Published 2026-04-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.012 · change: +0.004

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html (Vendor Advisory)

Frequently asked questions

What is CVE-2026-33602?: CVE-2026-33602 is a medium-severity vulnerability in Powerdns Dnsdist, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-04-22.
How severe is CVE-2026-33602?: Medium severity. CVSS v3 base score is 6.5 out of 10.