PowerDNS DNSdist up to 1.9.12/2.0.3 memory allocation

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in PowerDNS DNSdist up to 1.9.12/2.0.3. The impacted element is an unknown function. Performing a manipulation results in memory allocation. This vulnerability is cataloged as CVE-2026-33594. It is possible to initiate the attack remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in PowerDNS DNSdist up to 1.9.12/2.0.3. This affects some unknown processing. The manipulation with an unknown input leads to a memory allocation vulnerability. CWE is classifying the issue as CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. This is going to have an impact on availability. The summary by CVE is:

A client can trigger excessive memory allocation by generating a lot of queries that are routed to an overloaded DoH backend, causing queries to accumulate into a buffer that will not be released until the end of the connection.

The weakness was shared by Mehtab Zafar. It is possible to read the advisory at dnsdist.org. This vulnerability is uniquely identified as CVE-2026-33594 since 03/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not 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 vulnerability database at Tenable (321078). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / 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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Nessus ID: 321078
Nessus Name: Fedora 44 : dnsdist (2026-51cdd1292b)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: DNSdist 1.9.13/2.0.4

Timelineinfo

03/23/2026 CVE reserved
04/22/2026 +29 days Advisory disclosed
04/22/2026 +0 days VulDB entry created
06/15/2026 +54 days VulDB entry last update

Sourcesinfo

Advisory: dnsdist.org
Researcher: Mehtab Zafar
Status: Confirmed

CVE: CVE-2026-33594 (🔒)
GCVE (CVE): GCVE-0-2026-33594
GCVE (VulDB): GCVE-100-358959

Entryinfo

Created: 04/22/2026 17:28
Updated: 06/15/2026 19:22
Changes: 04/22/2026 17:28 (64), 06/15/2026 19:22 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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