Upstream information
Description
NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability in the jostle logic that could defeat its purpose and degrade resolution performance. Retransmits of the same query could renew the age of slow running queries and not allow the jostle logic to see them as aged and potential targets for replacement with new queries. An adversary who can query a vulnerable Unbound and who can control a domain name server that replies slowly and/or maliciously to Unbound's queries can exploit the vulnerability and degrade the resolution performance of Unbound. When Unbound's 'num-queries-per-thread' reaches its limit, the jostle logic kicks in. When a new query comes in, half of the available queries that are also slow to resolve are candidates for replacement. The vulnerability then happens because duplicate queries that need resolution would skew the aging result by using the timestamp of the latest duplicate query instead of the original one that started the resolution effort. Cache and local data response performance remains unaffected. Coordinated attacks could raise this to a denial of resolution service. Unbound 1.25.1 contains a patch with a fix to attach an initial, non-updatable start time for incoming queries that allow the jostle logic to work as intended.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 5.9 |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Network |
| Attack Complexity | High |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (NLnet Labs) |
|---|---|
| Base Score | 6.9 |
| Vector | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber |
| Attack Vector | Network |
| Attack Complexity | Low |
| Attack Requirements | None |
| Privileges Required | None |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | None |
| Vulnerable System Integrity Impact | None |
| Vulnerable System Availability Impact | Low |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
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 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | unbound | Affected |
| SUSE Linux Enterprise Micro 5.5 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | unbound | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP7 | unbound | Affected |
| SUSE Linux Enterprise Server 16.0 | unbound | Affected |
| SUSE Linux Enterprise Server 16.1 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | unbound | Affected |
| SUSE Linux Micro 6.0 | unbound | Affected |
| SUSE Linux Micro 6.1 | unbound | Affected |
| SUSE Linux Micro 6.2 | unbound | Affected |
| openSUSE Leap 16.0 | unbound | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP5 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP6 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | unbound | Affected |
| SUSE Manager Proxy 4.3 | unbound | Affected |
| SUSE Manager Proxy LTS 4.3 | unbound | Affected |
| SUSE Manager Retail Branch Server 4.3 | unbound | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | unbound | Affected |
| SUSE Manager Server 4.3 | unbound | Affected |
| SUSE Manager Server LTS 4.3 | unbound | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE CaaS Platform 4.0 | unbound | Affected |
| SUSE Enterprise Storage 6 | unbound | Affected |
| SUSE Enterprise Storage 7 | unbound | Affected |
| SUSE Enterprise Storage 7.1 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | unbound | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | unbound | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | unbound | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | unbound | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP1 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | unbound | Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | unbound | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | unbound | Affected |
| SUSE Manager Proxy 4.0 | unbound | Affected |
| SUSE Manager Proxy 4.1 | unbound | Affected |
| SUSE Manager Proxy 4.2 | unbound | Affected |
| SUSE Manager Retail Branch Server 4.0 | unbound | Affected |
| SUSE Manager Retail Branch Server 4.1 | unbound | Affected |
| SUSE Manager Retail Branch Server 4.2 | unbound | Affected |
| SUSE Manager Server 4.0 | unbound | Affected |
| SUSE Manager Server 4.1 | unbound | Affected |
| SUSE Manager Server 4.2 | unbound | Affected |
| openSUSE Leap 15.3 | unbound | Affected |
| openSUSE Leap 15.4 | unbound | Affected |
| openSUSE Leap 15.5 | unbound | Affected |
| openSUSE Leap 15.6 | unbound | Affected |
SUSE Timeline for this CVE
CVE page created: Tue May 19 10:30:36 2026CVE page last modified: Wed May 20 15:36:23 2026