CVE-2026-33261 | PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0 denial of service

VDB-358843 · CVE-2026-33261 · GCVE-0-2026-33261 POWERDNS RECURSOR UP TO 5.2.8/5.3.5/5.4.0 DENIAL OF SERVICE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.7 $0-$5k 1.25+ Summaryinfo A vulnerability identified as problematic has been detected in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0. Affected by this issue is some unknown functionality. This manipulation causes denial of service. This vulnerability appears as CVE-2026-33261. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component. Detailsinfo A vulnerability has been found in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0 and classified as problematic. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is: A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service. The weakness was presented by ylwango613. It is possible to read the advisory at docs.powerdns.com. This vulnerability is known as CVE-2026-33261 since 03/18/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK. Upgrading to version 5.2.9, 5.3.6 or 5.4.1 eliminates this vulnerability. Productinfo Type Domain Name Software Vendor PowerDNS Name Recursor Version 5.0 5.1 5.2 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 5.3 5.3.0 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.4.0 License free CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.8 VulDB Meta Temp Score: 4.7 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.9 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: Denial of service CWE: CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes 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: Recursor 5.2.9/5.3.6/5.4.1 Timelineinfo 03/18/2026 CVE reserved 04/22/2026 +34 days Advisory disclosed 04/22/2026 +0 days VulDB entry created 04/22/2026 +0 days VulDB entry last update Sourcesinfo Advisory: docs.powerdns.com Researcher: ylwango613 Status: Confirmed CVE: CVE-2026-33261 (🔒) GCVE (CVE): GCVE-0-2026-33261 GCVE (VulDB): GCVE-100-358843 Entryinfo Created: 04/22/2026 13:29 Changes: 04/22/2026 13:29 (30), 04/22/2026 13:30 (34) Complete: 🔍 Cache ID: 99:E84:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸