NULL pointer dereference in PowerDNS Recursor - CVE-2026-33600

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Main Vulnerability Database Vulnerabilities #VU126853

NULL pointer dereference in PowerDNS Recursor - CVE-2026-33600

Published: April 22, 2026


Vulnerability identifier: #VU126853
CSH Severity: Low
CVSS v4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-33600
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to null pointer dereference in RPZ transfer handling when processing a crafted RPZ from a malicious authoritative server. A remote privileged user can send a crafted RPZ to cause a denial of service.


Affected software

PowerDNS Recursor
Debian Linux
pdns-recursor (Debian package)

How to mitigate CVE-2026-33600

Install security update from vendor's website.

PowerDNS Recursor - addressed in versions 5.2.9, 5.3.6, 5.4.1
pdns-recursor (Debian package) - update to 5.2.9-0+deb13u1

External References

Related Security Bulletins