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CVE-2026-33601

Insufficient validation of zonemd record

Published: Apr 22, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-476
NVD MITRE
4.4CVSSMEDIUM
EPSS Score
0.5%
Top 60.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

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
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Weaknesses

CWE-476

Affected Products

recursorpowerdns
On-premNetwork Device
Networking Infrastructure / dns-dhcp-ntp
RecursorPowerDNS
On-premNetwork Device
Networking Infrastructure / dns-dhcp-ntp
powerdnsoss-projectDKNetworking Infrastructureaka powerdns recursor, powerdns authoritative, dnsdist

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

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 27, 2026

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