Upstream information

CVE-2026-69186 at MITRE

Description

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

SUSE information

Overall state of this security issue: Resolved

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 5.3 5.3
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network Network
Attack Complexity Low Low
Privileges Required None None
User Interaction None None
Scope Unchanged Unchanged
Confidentiality Impact None None
Integrity Impact None None
Availability Impact Low Low
CVSSv3 Version 3.1 3.1
SUSE Bugzilla entry: 1276291 [IN_PROGRESS]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
Container bci/nodejs:24.18.1-base-10.7
Container bci/nodejs:24.18.1-micro-10.7
Image SLES-SAP-BYOS-EC2
Image SLES-SAP-BYOS-GCE
Image SLES-SAP-EC2
Image SLES-SAP-GCE
Image SLES-SAP-GCE-3P
  • libcares2 >= 1.34.8-160000.1.1
Image SL-Micro-Azure
Image SL-Micro-BYOS-Azure
Image SL-Micro-BYOS-EC2
Image SL-Micro-EC2
Image SLE-Micro
Image SLE-Micro-Azure
Image SLE-Micro-BYOS
Image SLE-Micro-BYOS-Azure
Image SLE-Micro-BYOS-EC2
Image SLE-Micro-EC2
Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure
Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2
Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure
Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2
Image SUSE-Multi-Linux-Manager-Server-EC2-llc
Image SUSE-Multi-Linux-Manager-Server-EC2-ltd
  • libcares2 >= 1.34.8-slfo.1.1_1.1
Image SLES15-SP5-Azure-3P
Image SLES15-SP5-Azure-Standard
Image SLES15-SP5-BYOS-Azure
Image SLES15-SP5-BYOS-EC2
Image SLES15-SP5-BYOS-GCE
Image SLES15-SP5-EC2
Image SLES15-SP5-GCE
Image SLES15-SP6
Image SLES15-SP6-Azure-Standard
Image SLES15-SP6-BYOS
Image SLES15-SP6-BYOS-Azure
Image SLES15-SP6-BYOS-EC2
Image SLES15-SP6-EC2
Image SLES15-SP6-EC2-ECS-HVM
Image SLES15-SP6-SAP
Image SLES15-SP6-SAP-Azure
Image SLES15-SP6-SAP-BYOS
Image SLES15-SP6-SAP-BYOS-GCE
Image SLES15-SP6-SAP-EC2
Image SLES15-SP6-SAP-GCE
Image SLES15-SP6-SAPCAL
Image SLES15-SP6-SAPCAL-Azure
Image SLES15-SP6-SAPCAL-EC2
Image SLES15-SP6-SAPCAL-GCE
Image SLES15-SP7-Azure-3P
Image SLES15-SP7-Azure-Standard
Image SLES15-SP7-BYOS-GCE
Image SLES15-SP7-CHOST-BYOS-Azure
Image SLES15-SP7-CHOST-BYOS-EC2
Image SLES15-SP7-CHOST-BYOS-GCE
Image SLES15-SP7-CHOST-BYOS-GDC
Image SLES15-SP7-CHOST-BYOS-SAP-CCloud
Image SLES15-SP7-EC2
Image SLES15-SP7-GCE
Image SLES15-SP7-SAPCAL-Azure
Image SLES15-SP7-SAPCAL-EC2
  • libcares2 >= 1.34.8-150000.3.29.1
SUSE Linux Enterprise Desktop 15 SP7
SUSE Linux Enterprise Module for Basesystem 15 SP7
SUSE Linux Enterprise Server 15 SP7
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Module-Basesystem-15-SP7-2026-4021 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-4021 (aarch64,x86_64)
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-4021 (aarch64,x86_64)
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-4021 (aarch64,x86_64)
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-4021 (aarch64,x86_64)
SUSE Linux Enterprise Micro 5.3
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Micro-5.3-2026-4021 (aarch64,s390x,x86_64)
SUSE Linux Enterprise Micro 5.4
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Micro-5.4-2026-4021 (aarch64,s390x,x86_64)
SUSE Linux Enterprise Micro 5.5
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Micro-5.5-2026-4021 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise Server 15 SP4-LTSS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-4021 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise Server 15 SP5-LTSS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-4021 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise Server 15 SP6-LTSS
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-4021 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise Server 16.0
SUSE Linux Enterprise Server for SAP applications 16.0
  • c-ares-devel >= 1.34.8-160000.1.1
  • c-ares-utils >= 1.34.8-160000.1.1
  • libcares2 >= 1.34.8-160000.1.1
 Patchnames:
SUSE-SLES-16.0-1579 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Enterprise Server for SAP Applications 15 SP4
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP4-2026-4021 (ppc64le,x86_64)
SUSE Linux Enterprise Server for SAP Applications 15 SP5
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP5-2026-4021 (ppc64le,x86_64)
SUSE Linux Enterprise Server for SAP Applications 15 SP6
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SLES_SAP-15-SP6-2026-4021 (ppc64le,x86_64)
SUSE Linux Micro 6.0
  • libcares2 >= 1.34.8-1.1
 Patchnames:
SUSE-SLE-Micro-6.0-870 (aarch64,s390x,x86_64)
SUSE Linux Micro 6.1
  • libcares2 >= 1.34.8-slfo.1.1_1.1
 Patchnames:
SUSE-SLE-Micro-6.1-696 (aarch64,ppc64le,s390x,x86_64)
SUSE Linux Micro 6.2
  • libcares2 >= 1.34.8-160000.1.1
 Patchnames:
SUSE-SL-Micro-6.2-1579 (aarch64,ppc64le,s390x,x86_64)
SUSE Manager Proxy LTS 4.3
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Proxy-4.3-LTS-2026-4021 (x86_64)
SUSE Manager Retail Branch Server LTS 4.3
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Retail-Branch-Server-4.3-LTS-2026-4021 (x86_64)
SUSE Manager Server LTS 4.3
  • c-ares-devel >= 1.34.8-150000.3.29.1
  • libcares2 >= 1.34.8-150000.3.29.1
 Patchnames:
SUSE-SLE-Product-SUSE-Manager-Server-4.3-LTS-2026-4021 (ppc64le,s390x,x86_64)
openSUSE Leap 16.0
  • c-ares-devel >= 1.34.8-160000.1.1
  • c-ares-utils >= 1.34.8-160000.1.1
  • libcares2 >= 1.34.8-160000.1.1
 Patchnames:
openSUSE-Leap-16.0-1579
openSUSE Tumbleweed
  • c-ares-devel >= 1.34.8-1.1
  • c-ares-utils >= 1.34.8-1.1
  • libcares2 >= 1.34.8-1.1
  • libcares2-32bit >= 1.34.8-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-11593

First public cloud image revisions this CVE is fixed in:

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 c-ares Released
SUSE Linux Enterprise Micro 5.3 c-ares Released
SUSE Linux Enterprise Micro 5.4 c-ares Released
SUSE Linux Enterprise Micro 5.5 c-ares Released
SUSE Linux Enterprise Micro for Rancher 5.3 c-ares Released
SUSE Linux Enterprise Micro for Rancher 5.4 c-ares Released
SUSE Linux Enterprise Module for Basesystem 15 SP7 c-ares Released
SUSE Linux Enterprise Server 15 SP7 c-ares Released
SUSE Linux Enterprise Server 16.0 c-ares Released
SUSE Linux Enterprise Server 16.1 c-ares Released
SUSE Linux Enterprise Server for SAP Applications 15 SP7 c-ares Released
SUSE Linux Enterprise Server for SAP applications 16.0 c-ares Released
SUSE Linux Enterprise Server for SAP applications 16.1 c-ares Released
SUSE Linux Micro 6.0 c-ares Released
SUSE Linux Micro 6.1 c-ares Released
SUSE Linux Micro 6.2 c-ares Released
openSUSE Leap 16.0 c-ares Released
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS c-ares Released
SUSE Linux Enterprise High Performance Computing 15 SP5 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS c-ares Released
SUSE Linux Enterprise Module for Basesystem 15 SP4 c-ares Affected
SUSE Linux Enterprise Module for Basesystem 15 SP5 c-ares Affected
SUSE Linux Enterprise Module for Basesystem 15 SP6 c-ares Affected
SUSE Linux Enterprise Server 15 SP4 c-ares Affected
SUSE Linux Enterprise Server 15 SP4-LTSS c-ares Released
SUSE Linux Enterprise Server 15 SP5 c-ares Affected
SUSE Linux Enterprise Server 15 SP5-LTSS c-ares Released
SUSE Linux Enterprise Server 15 SP6 c-ares Affected
SUSE Linux Enterprise Server 15 SP6-LTSS c-ares Released
SUSE Linux Enterprise Server for SAP Applications 15 SP4 c-ares Released
SUSE Linux Enterprise Server for SAP Applications 15 SP5 c-ares Released
SUSE Linux Enterprise Server for SAP Applications 15 SP6 c-ares Released
Products past their end of life and not receiving proactive updates anymore.
SUSE CaaS Platform 4.0 c-ares Affected
SUSE Enterprise Storage 6 c-ares Affected
SUSE Enterprise Storage 7 c-ares Affected
SUSE Enterprise Storage 7.1 c-ares Affected
SUSE Linux Enterprise Desktop 15 c-ares Affected
SUSE Linux Enterprise Desktop 15 SP1 c-ares Affected
SUSE Linux Enterprise Desktop 15 SP2 c-ares Affected
SUSE Linux Enterprise Desktop 15 SP4 c-ares Affected
SUSE Linux Enterprise Desktop 15 SP5 c-ares Affected
SUSE Linux Enterprise Desktop 15 SP6 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP1 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 c-ares Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS c-ares Released
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS c-ares Released
SUSE Linux Enterprise High Performance Computing 15-ESPOS c-ares Affected
SUSE Linux Enterprise High Performance Computing 15-LTSS c-ares Affected
SUSE Linux Enterprise Micro 5.1 c-ares Affected
SUSE Linux Enterprise Micro 5.2 c-ares Affected
SUSE Linux Enterprise Module for Basesystem 15 c-ares Affected
SUSE Linux Enterprise Module for Basesystem 15 SP1 c-ares Affected
SUSE Linux Enterprise Module for Basesystem 15 SP2 c-ares Affected
SUSE Linux Enterprise Real Time 15 SP2 c-ares Affected
SUSE Linux Enterprise Real Time 15 SP3 c-ares Affected
SUSE Linux Enterprise Real Time 15 SP4 c-ares Affected
SUSE Linux Enterprise Server 15 c-ares Affected
SUSE Linux Enterprise Server 15 SP1 c-ares Affected
SUSE Linux Enterprise Server 15 SP1-BCL c-ares Affected
SUSE Linux Enterprise Server 15 SP1-LTSS c-ares Affected
SUSE Linux Enterprise Server 15 SP2 c-ares Affected
SUSE Linux Enterprise Server 15 SP2-BCL c-ares Affected
SUSE Linux Enterprise Server 15 SP2-LTSS c-ares Affected
SUSE Linux Enterprise Server 15 SP3-LTSS c-ares Affected
SUSE Linux Enterprise Server 15-LTSS c-ares Affected
SUSE Linux Enterprise Server for SAP Applications 15 c-ares Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP1 c-ares Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 c-ares Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 c-ares Affected
SUSE Manager Proxy 4.0 c-ares Affected
SUSE Manager Proxy 4.1 c-ares Affected
SUSE Manager Proxy 4.2 c-ares Affected
SUSE Manager Proxy 4.3 c-ares Affected
SUSE Manager Proxy LTS 4.3 c-ares Released
SUSE Manager Retail Branch Server 4.0 c-ares Affected
SUSE Manager Retail Branch Server 4.1 c-ares Affected
SUSE Manager Retail Branch Server 4.2 c-ares Affected
SUSE Manager Retail Branch Server 4.3 c-ares Affected
SUSE Manager Retail Branch Server LTS 4.3 c-ares Released
SUSE Manager Server 4.0 c-ares Affected
SUSE Manager Server 4.1 c-ares Affected
SUSE Manager Server 4.2 c-ares Affected
SUSE Manager Server 4.3 c-ares Affected
SUSE Manager Server LTS 4.3 c-ares Released
openSUSE Leap 15.4 c-ares Affected
openSUSE Leap 15.5 c-ares Affected
openSUSE Leap 15.6 c-ares Affected
openSUSE Leap Micro 5.2 c-ares Affected
openSUSE Leap Micro 5.3 c-ares Affected
openSUSE Leap Micro 5.4 c-ares Affected
openSUSE Leap Micro 5.5 c-ares Affected

SUSE Timeline for this CVE

CVE page created: Mon Aug 24 13:40:47 2026
CVE page last modified: Sun Sep 20 12:03:04 2026