CVE-2026-33601: medium-severity vulnerability in PowerDNS Recursor
Insufficient validation of zonemd record
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 4.4epss 0.5%
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:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
Affected products
PowerDNS · RecursorRelated CVEs — PowerDNS Recursor
In the same product, most dangerous first.
CVE-2024-25583HIGHCrafted responses can lead to a denial of service in Recursor if recursive forwarding is configuredEPSS 0.8%CVE-2025-30195HIGHA crafted zone can lead to an illegal memory access in the PowerDNS RecursorEPSS 0.8%CVE-2024-25590HIGHCrafted responses can lead to a denial of service due to cache inefficiencies in the RecursorEPSS 0.7%CVE-2026-33256MEDIUMUnbounded memory allocation by internal web serverEPSS 0.6%CVE-2023-26437LOWDeterred spoofing attempts can lead to authoritative servers being marked unavailableEPSS 0.6%CVE-2025-59030HIGHInsufficient validation of incoming notifies over TCP can lead to a denial of service in RecursorEPSS 0.6%