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Dnsdist EUVDEUVD-2026-17401

| CVE-2026-24028 MEDIUM
Buffer Over-read (CWE-126)
2026-03-31 OX
Denial Of Service Information Disclosure Buffer Overflow Dnsdist
5.3
CVSS 3.1 · NVD
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Severity by source

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

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

4
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

DescriptionCVE.org

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.

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Same weakness CWE-126 – Buffer Over-read

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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2015-5122 CRITICAL POC
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CVE-2011-0609 HIGH POC
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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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EUVD-2026-17401 vulnerability details – vuln.today
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