PowerDNS DNSdist up to 1.9.12/2.0.3 SVCB auto_upgrade out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.0$0-$5k0.27

Summaryinfo

A vulnerability labeled as problematic has been found in PowerDNS DNSdist up to 1.9.12/2.0.3. This issue affects the function auto_upgrade of the component SVCB Handler. The manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-33599. The attack can only be performed from the local network. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in PowerDNS DNSdist up to 1.9.12/2.0.3. Affected is the function auto_upgrade of the component SVCB Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. CVE summarizes:

A rogue backend can send a crafted SVCB response to a Discovery of Designated Resolvers request, when requested via either the autoUpgrade (Lua) option to newServer or auto_upgrade (YAML) settings. DDR upgrade is not enabled by default.

The weakness was released by ylwango613. The advisory is shared for download at dnsdist.org. This vulnerability is traded as CVE-2026-33599 since 03/23/2026. The exploitability is told to be difficult. The attack needs to be done within the local network. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 1.9.13 or 2.0.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-24941). Once again VulDB remains the best 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: 3.1
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.1
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.1
CNA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
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: 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
04/22/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: dnsdist.org
Researcher: ylwango613
Status: Confirmed

CVE: CVE-2026-33599 (🔒)
GCVE (CVE): GCVE-0-2026-33599
GCVE (VulDB): GCVE-100-358956
EUVD: 🔒

Entryinfo

Created: 04/22/2026 17:27
Updated: 04/22/2026 18:35
Changes: 04/22/2026 17:27 (66), 04/22/2026 18:35 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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