CVE-2026-33601

Insufficient validation of zonemd record

Published Apr 22, 2026 CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6234-1 pdns-recursor security update
History
Type Values Removed Values Added
CPEs cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Powerdns
Powerdns recursor
Weaknesses CWE-476
Vendors & Products Powerdns
Powerdns recursor
Type Values Removed Values Added
Description 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.
Title Insufficient validation of zonemd record
References
Metrics cvssV3_1

{'score': 4.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
OX
Published
Updated
Apr 22, 2026, 6:10 PM
Reserved
Mar 23, 2026, 12:57 PM
Status
Analyzed
Published
Apr 22, 2026, 10:16 AM
Modified
Oct 26, 2026, 12:10 AM