What is CVE-2026-33601?

CVE-2026-33601 is a medium-severity vulnerability in Powerdns Recursor. CVSS score: 4.4/10. Published 2026-04-22.

How severe is CVE-2026-33601?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Vulnerability in Powerdns Recursor

CVE-2026-33601

If you use the zoneToCache function with a malicious authoritative server, an attacker can send a zone that result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

EPSS: 0.000 (0.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Powerdns Recursor — versions 5.4.0, 5.3.0, 5.2.0

References

docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-…

Frequently asked questions

What is CVE-2026-33601?: CVE-2026-33601 is a medium-severity vulnerability in Powerdns Recursor. CVSS score: 4.4/10. Published 2026-04-22.
How severe is CVE-2026-33601?: Medium severity. CVSS v3 base score is 4.4 out of 10.