What is CVE-2026-33600?

CVE-2026-33600 is a medium-severity vulnerability in Powerdns Recursor, classified under NULL Pointer Dereference. CVSS score: 4.4/10. Published 2026-04-22.

How severe is CVE-2026-33600?

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

NULL pointer dereference in Powerdns Recursor

CVE-2026-33600

An RPZ sent by a malicious authoritative server can result in a null pointer dereference, caused by a missing consistency check and leading to a denial of service.

EPSS: 0.005 (40.9th 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

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security@open-xchange.com (Broken Link, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33600?: CVE-2026-33600 is a medium-severity vulnerability in Powerdns Recursor, classified under NULL Pointer Dereference. CVSS score: 4.4/10. Published 2026-04-22.
How severe is CVE-2026-33600?: Medium severity. CVSS v3 base score is 4.4 out of 10.