PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2 Configuration information disclosure

Summaryinfo

A vulnerability classified as problematic was found in PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2. Affected is an unknown function of the component Configuration Handler. Such manipulation leads to information disclosure. This vulnerability is documented as CVE-2026-40012. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in PowerDNS Recursor up to 5.2.10/5.3.7/5.4.2 and classified as problematic. Affected by this issue is an unknown function of the component Configuration Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. CVE summarizes:

ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations that have ECS enabled;

The weakness was released by Danial Mahadzir. The advisory is shared for download at docs.powerdns.com. This vulnerability is handled as CVE-2026-40012 since 04/08/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 5.2.11, 5.3.8 or 5.4.3 eliminates this vulnerability.

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Productinfo

Type

• Domain Name Software

Vendor

• PowerDNS

Name

• Recursor

Version

• 5.2.0
• 5.2.1
• 5.2.2
• 5.2.3
• 5.2.4
• 5.2.5
• 5.2.6
• 5.2.7
• 5.2.8
• 5.2.9
• 5.2.10
• 5.3.0
• 5.3.1
• 5.3.2
• 5.3.3
• 5.3.4
• 5.3.5
• 5.3.6
• 5.3.7
• 5.4.0
• 5.4.1
• 5.4.2

License

• free

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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• 🔒
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