CVE-2026-33259 | PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0 use after free

VDB-358836 · CVE-2026-33259 · GCVE-0-2026-33259 POWERDNS RECURSOR UP TO 5.2.8/5.3.5/5.4.0 USE AFTER FREE HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.4 $0-$5k 0.75+ Summaryinfo A vulnerability, which was classified as critical, was found in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0. Impacted is an unknown function. The manipulation results in use after free. This vulnerability is identified as CVE-2026-33259. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in PowerDNS Recursor up to 5.2.8/5.3.5/5.4.0. It has been classified as problematic. Affected is some unknown functionality. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes: Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a malfunctioning RPZ provider. The weakness was released by Haruto Kimura. The advisory is shared for download at docs.powerdns.com. This vulnerability is traded as CVE-2026-33259 since 03/18/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available. 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: 4.5 VulDB Meta Temp Score: 4.4 VulDB Base Score: 4.1 VulDB Temp Score: 3.9 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.0 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: Use after free CWE: CWE-416 / CWE-119 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: Haruto Kimura Status: Confirmed CVE: CVE-2026-33259 (🔒) GCVE (CVE): GCVE-0-2026-33259 GCVE (VulDB): GCVE-100-358836 Entryinfo Created: 04/22/2026 13:28 Changes: 04/22/2026 13:28 (64) Complete: 🔍 Cache ID: 99:670:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸