CVE-2026-33600
Received Received - Intake

Null Pointer Dereference in RPZ Handling Causes Denial of Service

Publication date: 2026-04-22

Last updated on: 2026-04-27

Assigner: Open-Xchange

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.

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Meta Information

Published
2026-04-22
Last Modified
2026-04-27
Generated
2026-07-06
AI Q&A
2026-04-22
EPSS Evaluated
2026-07-05
NVD
CVE-2026-33600
EUVD
EUVD-2026-24731

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
powerdns recursor From 5.2.0 (inc) to 5.2.9 (exc)
powerdns recursor From 5.3.0 (inc) to 5.3.6 (exc)
powerdns recursor 5.4.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.

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Executive Summary

This vulnerability occurs when a Response Policy Zone (RPZ) sent by a malicious authoritative server causes a null pointer dereference due to a missing consistency check.

The null pointer dereference leads to a denial of service condition.

Impact Analysis

The vulnerability can cause a denial of service (DoS) on the affected system.

This means that the system or service may become unavailable or crash when processing malicious RPZ data.

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