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

EPSS: 0.007 (50.2th percentile) — read the EPSS interpretation.

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.

Affected products

Powerdns Dnsdist — versions 1.9.0, 2.0.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

security@open-xchange.com (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.