Medium severity · published Apr 22, 2026
CVE-2026-33600
Null pointer dereference in RPZ transfer
4.9
CVSS
0.5%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
Recursor · PowerDNS
5.4.0 before 5.4.1; 5.3.0 before 5.3.6; 5.2.0 before 5.2.9 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33600
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33600
Broken Link
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html
More from Recursor
9.8
CVE-2019-3807
An issue has been found in PowerDNS Recursor versions 4.1.x before 4.1.9 where records in the answer section of responses received from authoritative servers with the AA flag not…
8.8
CVE-2020-10030
An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0
8.2
CVE-2025-59023
Crafted delegations or IP fragments can poison cached delegations in Recursor
8.1
CVE-2019-3806
An issue has been found in PowerDNS Recursor versions after 4.1.3 before 4.1.9 where Lua hooks are not properly applied to queries received over TCP in some specific combination…
7.5
CVE-2026-52688
RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation