CVE-2026-33600: Null pointer dereference in RPZ transfer

Published Apr 22, 2026
·
Updated

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.

Affected Software

4 affected components
ISC BIND
PowerDNS recursor>=5.2.0<5.2.9
PowerDNS recursor>=5.3.0<5.3.6
PowerDNS recursor=5.4.0

Event History

Apr 22, 2026
CVE Published
via MITRE·09:33 AM
Data Sourced
via MITRE·09:33 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:16 AM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-33600?

The severity of CVE-2026-33600 is classified as critical due to the potential for denial of service.

2

How do I fix CVE-2026-33600?

To fix CVE-2026-33600, upgrade to the latest version of ISC BIND that addresses this vulnerability.

3

What causes the vulnerability CVE-2026-33600?

CVE-2026-33600 is caused by a null pointer dereference due to a missing consistency check in RPZ transfer.

4

What systems are affected by CVE-2026-33600?

CVE-2026-33600 primarily affects ISC BIND DNS software.

5

What are the potential impacts of CVE-2026-33600?

The potential impacts of CVE-2026-33600 include a denial of service, affecting the availability of DNS services.

Company

Resources

Contact

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CVE-2026-33600 - Null pointer dereference in RPZ transfer - SecAlerts