CVE-2026-33599 | PowerDNS DNSdist up to 1.9.12/2.0.3 SVCB auto_upgrade out-of-bounds

VDB-358956 · CVE-2026-33599 · GCVE-0-2026-33599 POWERDNS DNSDIST UP TO 1.9.12/2.0.3 SVCB AUTO_UPGRADE OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.0 $0-$5k 0.25+ 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. 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 🔒 🔒 🔒 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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 Entryinfo Created: 04/22/2026 17:27 Changes: 04/22/2026 17:27 (66) Complete: 🔍 Cache ID: 99:083:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸