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CVE-2026-33601

Insufficient validation of zonemd record

Published: Apr 22, 2026Updated: Apr 22, 2026 Sources: CVE List NVD
NVD MITRE
4.4CVSS
MEDIUM

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 Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:HPR:HUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Affected Products

Recursor
PowerDNS

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html
docs.powerdns.com

Timeline

Published
Apr 22, 2026
Last Updated
Apr 22, 2026

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