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Dnsdist CVE-2026-24028

| EUVDEUVD-2026-17401 HIGH
Buffer Over-read (CWE-126)
2026-03-31 OX
8.2
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

7
Re-analysis Queued
Jul 25, 2026 - 10:22 vuln.today
cvss_changed
Severity Changed
Jul 25, 2026 - 10:22 NVD
MEDIUM HIGH
CVSS changed
Jul 25, 2026 - 10:22 NVD
5.3 (MEDIUM) 8.2 (HIGH)
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
EUVD ID Assigned
Mar 31, 2026 - 12:15 euvd
EUVD-2026-17401
Analysis Generated
Mar 31, 2026 - 12:15 vuln.today
CVE Published
Mar 31, 2026 - 11:57 nvd
MEDIUM 5.3

DescriptionNVD

An attacker might be able to trigger an out-of-bounds read by sending a crafted DNS response packet, when custom Lua code uses newDNSPacketOverlay to parse DNS packets. The out-of-bounds read might trigger a crash, leading to a denial of service, or access unrelated memory, leading to potential information disclosure.

AnalysisAI

Out-of-bounds read in PowerDNS dnsdist allows unauthenticated remote attackers to trigger denial of service or potential information disclosure by sending a crafted DNS response packet when custom Lua code uses the newDNSPacketOverlay function to parse packets. CVSS 5.3 indicates moderate severity with network-accessible attack surface and no privilege or user interaction required.

Technical ContextAI

PowerDNS dnsdist is a DNS load balancer and traffic distributor that supports Lua scripting for custom packet processing. The vulnerability exists in the newDNSPacketOverlay function, which is used by Lua code to parse DNS packet structures. The out-of-bounds read occurs when parsing a specially crafted DNS response packet, indicating a buffer boundary violation in the packet overlay parsing logic. This is a classic memory safety issue where the packet parser fails to properly validate offsets or length fields before reading from memory, allowing an attacker to read past the intended buffer boundary.

RemediationAI

Patch available per vendor advisory. Users should immediately update dnsdist to the patched version referenced in the PowerDNS advisory at https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-02.html. If patching cannot be deployed immediately, restrict DNS response ingestion from untrusted sources or disable custom Lua scripts that use newDNSPacketOverlay until the update is available. Administrators should audit their Lua configurations to identify any use of newDNSPacketOverlay to assess exploitation risk in their environment.

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-2026-33593 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

CVE-2026-33594 MEDIUM
5.3 Apr 22

dnsdist can be forced into excessive memory allocation when a client generates high volumes of DNS queries routed to an

Vendor StatusVendor

Debian

dnsdist
Release Status Fixed Version Urgency
bullseye fixed (unfixed) end-of-life
bookworm fixed (unfixed) end-of-life
trixie vulnerable 1.9.10-1+deb13u1 -
forky vulnerable 2.0.2-1 -
sid fixed 2.0.3-1 -
(unstable) fixed 2.0.3-1 -

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-2026-24028 vulnerability details – vuln.today

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