PowerDNS DNSdist up to 1.9.12/2.0.3 integer overflow

Summaryinfo

A vulnerability classified as problematic was found in PowerDNS DNSdist up to 1.9.12/2.0.3. This affects an unknown function. Executing a manipulation can lead to integer overflow. This vulnerability is registered as CVE-2026-33596. The attack requires access to the local network. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in PowerDNS DNSdist up to 1.9.12/2.0.3 and classified as problematic. This vulnerability affects an unknown function. The manipulation with an unknown input leads to a integer overflow vulnerability. The CWE definition for the vulnerability is CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. As an impact it is known to affect availability. CVE summarizes:

A client might theoretically be able to cause a mismatch between queries sent to a backend and the received responses by sending a flood of perfectly timed queries that are routed to a TCP-only or DNS over TLS backend.

The weakness was published by ylwango613. The advisory is shared for download at dnsdist.org. This vulnerability was named CVE-2026-33596 since 03/23/2026. The exploitation appears to be difficult. The attack needs to approached within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 321078 (Fedora 44 : dnsdist (2026-51cdd1292b)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.9.13 or 2.0.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (321078) and EUVD (EUVD-2026-24935). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Domain Name Software

Vendor

• PowerDNS

Name

• DNSdist

Version

• 1.9.0
• 1.9.1
• 1.9.2
• 1.9.3
• 1.9.4
• 1.9.5
• 1.9.6
• 1.9.7
• 1.9.8
• 1.9.9
• 1.9.10
• 1.9.11
• 1.9.12
• 2.0.0
• 2.0.1
• 2.0.2
• 2.0.3

License

• open-source

CPE 2.3info

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CPE 2.2info

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Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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