PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0 null pointer dereference

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability was found in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0. It has been rated as problematic. Affected is an unknown function. The manipulation leads to null pointer dereference. This vulnerability is documented as CVE-2026-33600. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0. This issue affects an unknown function. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. The summary by CVE is:

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.

The weakness was released by ylwango613. The advisory is shared at docs.powerdns.com. The identification of this vulnerability is CVE-2026-33600 since 03/23/2026. The exploitation is known to be difficult. The attack may be initiated remotely. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available.

Upgrading to version 5.2.9, 5.3.6 or 5.4.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1225). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Debian Linux
  • SUSE openSUSE
  • Open Source PowerDNS

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 2.2
VulDB Temp Score: 2.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.4
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Recursor 5.2.9/5.3.6/5.4.1

Timelineinfo

03/23/2026 CVE reserved
04/22/2026 +29 days Advisory disclosed
04/22/2026 +0 days VulDB entry created
05/03/2026 +11 days VulDB entry last update

Sourcesinfo

Advisory: docs.powerdns.com
Researcher: ylwango613
Status: Confirmed

CVE: CVE-2026-33600 (🔒)
GCVE (CVE): GCVE-0-2026-33600
GCVE (VulDB): GCVE-100-358841
CERT Bund: WID-SEC-2026-1225 - PowerDNS: Mehrere Schwachstellen

Entryinfo

Created: 04/22/2026 13:29
Updated: 05/03/2026 23:38
Changes: 04/22/2026 13:29 (64), 05/03/2026 23:38 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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