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dnsdist CVE-2026-33598

| EUVDEUVD-2026-24939 MEDIUM
Out-of-bounds Read (CWE-125)
2026-04-22 security@open-xchange.com GHSA-vx33-3w38-3rj6
4.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.8 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
SUSE
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

Lifecycle Timeline

6
Patch released
Apr 24, 2026 - 18:51 nvd
Patch available
Patch available
Apr 22, 2026 - 16:33 EUVD
Analysis Generated
Apr 22, 2026 - 15:02 vuln.today
EUVD ID Assigned
Apr 22, 2026 - 14:22 euvd
EUVD-2026-24939
Analysis Generated
Apr 22, 2026 - 14:22 vuln.today
CVE Published
Apr 22, 2026 - 14:16 nvd
MEDIUM 4.8

DescriptionCVE.org

A cached crafted response can cause an out-of-bounds read if custom Lua code calls getDomainListByAddress() or getAddressListByDomain() on a packet cache.

AnalysisAI

Out-of-bounds memory read in dnsdist allows remote attackers to trigger information disclosure or denial of service when custom Lua code invokes getDomainListByAddress() or getAddressListByDomain() functions on a crafted packet cache entry. The vulnerability requires network access but has high attack complexity, limiting real-world exploitation despite the remote attack vector.

Technical ContextAI

dnsdist is a DNS load balancer and distributor written in C++ that supports custom Lua scripting for policy and packet manipulation. The vulnerability exists in the Lua bindings for packet cache query functions-specifically getDomainListByAddress() and getAddressListByDomain()-which do not properly validate response boundaries before reading cached DNS response data. When a maliciously crafted DNS response is cached and subsequently queried via these Lua functions, the parser reads beyond allocated buffer boundaries. This is a classic buffer bounds violation in C++ code interfacing with a scripting language that lacks automatic bounds checking.

RemediationAI

Apply the patch released in PowerDNS advisory powerdns-advisory-for-dnsdist-2026-04 (https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html). Exact patched version number not specified in provided data; consult the advisory for the minimum upgrade version. As an interim compensating control, disable or restrict Lua scripting features if not essential to operations, or audit custom Lua policies to remove calls to getDomainListByAddress() and getAddressListByDomain() until patching is complete. Note that disabling Lua may impact DNS load balancing or custom routing policies depending on deployment design.

CVE-2017-7557 HIGH
8.8 Aug 22

dnsdist version 1.1.0 is vulnerable to a flaw in authentication mechanism for REST API potentially allowing CSRF attack.

CVE-2026-24028 HIGH
8.2 Mar 31

Out-of-bounds read in PowerDNS dnsdist allows unauthenticated remote attackers to trigger denial of service or potential

CVE-2026-33593 HIGH
7.5 Apr 22

Remote denial of service in dnsdist allows unauthenticated attackers to crash the DNS load balancer by sending specially

CVE-2026-27853 HIGH
7.5 Mar 31

DNSdist fails to validate packet size bounds when rewriting DNS questions or responses via Lua methods (DNSQuestion:chan

CVE-2026-24030 HIGH
7.5 Mar 31

Memory exhaustion in DNSdist allows remote, unauthenticated attackers to trigger denial of service by crafting malicious

CVE-2026-27854 HIGH
7.5 Mar 31

DNSdist instances using custom Lua code can be crashed via denial of service when the DNSQuestion:getEDNSOptions method

CVE-2026-33602 MEDIUM
6.5 Apr 22

DNSdist is vulnerable to denial of service via out-of-bounds write when processing crafted UDP responses from a rogue ba

CVE-2026-24029 MEDIUM
6.5 Mar 31

PowerDNS dnsdist allows unauthenticated DNS over HTTPS (DoH) queries to bypass access control lists when the early_acl_d

CVE-2018-14663 MEDIUM
5.9 Nov 26

An issue has been found in PowerDNS DNSDist before 1.3.3 allowing a remote attacker to craft a DNS query with trailing d

CVE-2026-33260 MEDIUM
5.3 Apr 22

Denial of service in PowerDNS Authoritative, Recursor, and dnsdist via unbounded memory allocation in their internal web

CVE-2026-33257 MEDIUM
5.3 Apr 22

Unlimited memory allocation in PowerDNS internal web server allows remote denial of service via crafted web requests. Th

CVE-2026-33595 MEDIUM
5.3 Apr 22

dnsdist allows remote denial-of-service attacks through memory exhaustion by generating numerous error responses on sing

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server 16.0 Fixed

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CVE-2026-33598 vulnerability details – vuln.today

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