Upstream information

CVE-2026-81634 at MITRE

Description

In NLnet Labs Unbound up to and including 1.26.0, a 255 length query name with a large TCP response can lead to a heap buffer overflow during the RRSet canonicalisation routine. This is caused by missing to add the first owner name into the buffer length check. A malicious actor operating a malicious name server or tampering with an incoming response to Unbound (canonicalisation happens before DNSSEC validation), can trigger the vulnerability.

SUSE information

Overall state of this security issue: New

This issue is currently rated as having important severity.

CVSS v3 Scores
CVSS detail CNA (NLnet Labs)
Base Score 7.5
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
CVSSv3 Version 3.1
SUSE Bugzilla entry: 1280409 [NEW]

No SUSE Security Announcements cross referenced.


Status of this issue by product and package

Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.

Product(s) Source package State
Products under general support and receiving all security fixes.
SUSE Linux Enterprise Desktop 15 SP7 unbound Analysis
SUSE Linux Enterprise Micro 5.5 unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP7 unbound Analysis
SUSE Linux Enterprise Module for Package Hub 15 SP7 unbound Analysis
SUSE Linux Enterprise Server 15 SP7 unbound Analysis
SUSE Linux Enterprise Server 16.0 unbound Analysis
SUSE Linux Enterprise Server 16.1 unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP7 unbound Analysis
SUSE Linux Enterprise Server for SAP applications 16.0 unbound Analysis
SUSE Linux Enterprise Server for SAP applications 16.1 unbound Analysis
SUSE Linux Micro 6.0 unbound Analysis
SUSE Linux Micro 6.1 unbound Analysis
SUSE Linux Micro 6.2 unbound Analysis
openSUSE Leap 16.0 unbound Analysis
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP4 unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP5 unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP6 unbound Analysis
SUSE Linux Enterprise Server 15 SP4 unbound Analysis
SUSE Linux Enterprise Server 15 SP4-LTSS unbound Analysis
SUSE Linux Enterprise Server 15 SP5 unbound Analysis
SUSE Linux Enterprise Server 15 SP5-LTSS unbound Analysis
SUSE Linux Enterprise Server 15 SP6 unbound Analysis
SUSE Linux Enterprise Server 15 SP6-LTSS unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP4 unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP5 unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP6 unbound Analysis
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 unbound Analysis
SUSE Enterprise Storage 6 unbound Analysis
SUSE Enterprise Storage 7 unbound Analysis
SUSE Enterprise Storage 7.1 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP1 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP2 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP3 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP4 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP5 unbound Analysis
SUSE Linux Enterprise Desktop 15 SP6 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP2 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP4 unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS unbound Analysis
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP1 unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP2 unbound Analysis
SUSE Linux Enterprise Module for Basesystem 15 SP3 unbound Analysis
SUSE Linux Enterprise Module for Package Hub 15 SP3 unbound Analysis
SUSE Linux Enterprise Module for Package Hub 15 SP4 unbound Analysis
SUSE Linux Enterprise Module for Package Hub 15 SP5 unbound Analysis
SUSE Linux Enterprise Module for Package Hub 15 SP6 unbound Analysis
SUSE Linux Enterprise Real Time 15 SP2 unbound Analysis
SUSE Linux Enterprise Real Time 15 SP3 unbound Analysis
SUSE Linux Enterprise Real Time 15 SP4 unbound Analysis
SUSE Linux Enterprise Server 15 SP1 unbound Analysis
SUSE Linux Enterprise Server 15 SP1-BCL unbound Analysis
SUSE Linux Enterprise Server 15 SP1-LTSS unbound Analysis
SUSE Linux Enterprise Server 15 SP2 unbound Analysis
SUSE Linux Enterprise Server 15 SP2-BCL unbound Analysis
SUSE Linux Enterprise Server 15 SP2-LTSS unbound Analysis
SUSE Linux Enterprise Server 15 SP3 unbound Analysis
SUSE Linux Enterprise Server 15 SP3-BCL unbound Analysis
SUSE Linux Enterprise Server 15 SP3-LTSS unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP1 unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP2 unbound Analysis
SUSE Linux Enterprise Server for SAP Applications 15 SP3 unbound Analysis
SUSE Manager Proxy 4.0 unbound Analysis
SUSE Manager Proxy 4.1 unbound Analysis
SUSE Manager Proxy 4.2 unbound Analysis
SUSE Manager Proxy 4.3 unbound Analysis
SUSE Manager Proxy LTS 4.3 unbound Analysis
SUSE Manager Retail Branch Server 4.0 unbound Analysis
SUSE Manager Retail Branch Server 4.1 unbound Analysis
SUSE Manager Retail Branch Server 4.2 unbound Analysis
SUSE Manager Retail Branch Server 4.3 unbound Analysis
SUSE Manager Retail Branch Server LTS 4.3 unbound Analysis
SUSE Manager Server 4.0 unbound Analysis
SUSE Manager Server 4.1 unbound Analysis
SUSE Manager Server 4.2 unbound Analysis
SUSE Manager Server 4.3 unbound Analysis
SUSE Manager Server LTS 4.3 unbound Analysis
openSUSE Leap 15.3 unbound Analysis
openSUSE Leap 15.4 unbound Analysis
openSUSE Leap 15.5 unbound Analysis
openSUSE Leap 15.6 unbound Analysis


SUSE Timeline for this CVE

CVE page created: Thu Sep 17 16:08:10 2026
CVE page last modified: Thu Sep 17 16:08:10 2026