Crash when handling long CNAME response in net

Summary

CVECVE-2026-33811
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-07 20:16:42 UTC
Updated2026-07-31 13:17:54 UTC
DescriptionWhen using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.047170000 (date 2026-05-12)

Problem Types: CWE-415 | CWE-1341 | CWE-415: Double Free | CWE-1341 Multiple Releases of Same Resource or Handle


VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1ADPCVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Go All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go Standard Library Net affected 1.25.10 semver Not specified
CNA Go Standard Library Net affected 1.26.0-0 1.26.3 semver Not specified
ADP Red Hat Cryostat 4 On RHEL 9 unaffected 4.2.0-19 * rpm Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.5 For RHEL 8 unaffected 0:1.6.6-1.el8ap * rpm Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.5 For RHEL 9 unaffected 0:1.6.6-1.el9ap * rpm Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.6 For RHEL 10 unaffected 0:1.6.6-1.el10ap * rpm Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.6 For RHEL 9 unaffected 0:1.6.6-1.el9ap * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:0.152.1-1.el10_2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:0.9.27-7.el10_2.2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.7.1-5.el10_2.6 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:0.4.9.2-1.el10_2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 10 unaffected 0:0.2.10-1.el10_2 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 1:0.2.5-8.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 8100020260709093628.afee755d * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.4.1-12.el8_10 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 0:0.152.1-1.el9_8 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.2.11-2.el9_8 * rpm Not specified
ADP Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.7.1-4.el9_8.2 * rpm Not specified
ADP Red Hat Red Hat OpenStack Services On OpenShift 18.0 unaffected 0:0.1.1-18.0.20260602234716.a95ae05.el9ost * rpm Not specified
ADP Red Hat Red Hat Satellite 6.16 For RHEL 8 unaffected 0:0.0.4-1.el8sat * rpm Not specified
ADP Red Hat Red Hat Satellite 6.16 For RHEL 9 unaffected 0:0.0.4-1.el9sat * rpm Not specified
ADP Red Hat Red Hat Satellite 6.17 For RHEL 9 unaffected 0:0.0.4-1.el9sat * rpm Not specified
ADP Red Hat Red Hat Satellite 6.18 For RHEL 9 unaffected 0:0.0.4-1.el9sat * rpm Not specified
ADP Red Hat Red Hat Satellite 6.19 For RHEL 9 unaffected 0:0.0.4-1.el9sat * rpm Not specified
ADP Red Hat RHEM 1.0 For RHEL 9 unaffected 0:1.0.3-1.el9em * rpm Not specified
ADP Red Hat RHEM 1.1 For RHEL 10 unaffected 0:1.1.3-1.el10em * rpm Not specified
ADP Red Hat RHEM 1.1 For RHEL 9 unaffected 0:1.1.3-1.el9em * rpm Not specified
ADP Red Hat Logging For Red Hat OpenShift 6.4 unaffected 1782408807 * rpm Not specified
ADP Red Hat Logging Subsystem For Red Hat OpenShift 6.2 unaffected 1784747813 * rpm Not specified
ADP Red Hat Multicluster Engine For Kubernetes 2.10 unaffected 1784915379 * rpm Not specified
ADP Red Hat Multicluster Engine For Kubernetes 2.6 unaffected 1783985999 * rpm Not specified
ADP Red Hat Multicluster Engine For Kubernetes 2.8 unaffected 1784306906 * rpm Not specified
ADP Red Hat Multicluster Global Hub 1.4.5 unaffected 1784061472 * rpm Not specified
ADP Red Hat Multicluster Global Hub 1.6.2 unaffected 1784152046 * rpm Not specified
ADP Red Hat Multicluster Global Hub 1.7.2 unaffected 1784768332 * rpm Not specified
ADP Red Hat OpenShift API For Data Protection 1.6 unaffected 1784058822 * rpm Not specified
ADP Red Hat Red Hat Advanced Cluster Security For Kubernetes 4.10 unaffected 1783357140 * rpm Not specified
ADP Red Hat Red Hat Advanced Cluster Security For Kubernetes 4.11 unaffected 1783352589 * rpm Not specified
ADP Red Hat Red Hat Advanced Cluster Security For Kubernetes 4.9 unaffected 1783357116 * rpm Not specified
ADP Red Hat Red Hat Ansible Automation Platform 2.6 unaffected 1783962464 * rpm Not specified
ADP Red Hat Red Hat Developer Hub 1.9 unaffected 1782767215 * rpm Not specified
ADP Red Hat Red Hat Edge Manager 1.0 unaffected 1783502438 * rpm Not specified
ADP Red Hat Red Hat Edge Manager 1.1 unaffected 1784194574 * rpm Not specified
ADP Red Hat Red Hat Edge Manager 1.1 unaffected 1784127736 * rpm Not specified
ADP Red Hat Red Hat Hardened Images unaffected 1.25.11-2.hum1 * rpm Not specified
ADP Red Hat Red Hat Hardened Images unaffected 1.26.4-2.hum1 * rpm Not specified
ADP Red Hat Red Hat Migration Toolkit 1.8 unaffected 1783914276 * rpm Not specified
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ADP Red Hat Red Hat Multicluster Global Hub 1.5.0 unaffected 1784127491 * rpm Not specified
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ADP Red Hat Red Hat Trusted Artifact Signer 1.4 unaffected 4-1.4.2 * rpm Not specified
ADP Red Hat Red Hat Trusted Artifact Signer 1.4 unaffected 4-1.4.3 * rpm Not specified
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ADP Red Hat OpenShift Source-to-Image S2I Not specified Not specified
ADP Red Hat Power Monitoring For Red Hat OpenShift Not specified Not specified
ADP Red Hat Red Hat 3scale API Management Platform 2 Not specified Not specified
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ADP Red Hat Red Hat Advanced Cluster Management For Kubernetes 2 Not specified Not specified
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ADP Red Hat Red Hat Build Of Apicurio Registry 2 Not specified Not specified
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ADP Red Hat Red Hat Ceph Storage 5 Not specified Not specified
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ADP Red Hat Red Hat Certification Program For Red Hat Enterprise Linux 9 Not specified Not specified
ADP Red Hat Red Hat Connectivity Link 1 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
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ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
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ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux AI RHEL AI 3 Not specified Not specified
ADP Red Hat Red Hat Lightspeed For Runtimes Operator Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
ADP Red Hat Red Hat OpenShift AI RHOAI Not specified Not specified
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ADP Red Hat Red Hat Openshift Data Foundation 4 Not specified Not specified
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ADP Red Hat Red Hat OpenShift Dev Spaces Not specified Not specified
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ADP Red Hat Red Hat OpenShift Distributed Tracing 3 Not specified Not specified
ADP Red Hat Red Hat OpenShift For Windows Containers Not specified Not specified
ADP Red Hat Red Hat OpenShift On AWS Not specified Not specified
ADP Red Hat Red Hat OpenShift Virtualization 4 Not specified Not specified
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ADP Red Hat Red Hat OpenStack Platform 16.2 Not specified Not specified
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ADP Red Hat Security Profiles Operator Not specified Not specified
ADP Red Hat Service Telemetry Framework 1.5 Not specified Not specified
ADP Red Hat Streams For Apache Kafka 3 Not specified Not specified
ADP Red Hat Zero Trust Workload Identity Manager Not specified Not specified
ADP Red Hat Zero Trust Workload Identity Manager - Tech Preview Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:40118 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34357 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36797 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:41928 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:43038 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:43692 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:23262 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:35832 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:47735 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42132 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36651 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:35993 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:47149 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:47952 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42150 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:39266 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42644 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:35994 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:40945 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42946 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42050 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
go.dev/issue/78803 [email protected] go.dev Issue Tracking
access.redhat.com/errata/RHSA-2026:39319 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:34364 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36207 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42047 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33123 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
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bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33811.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
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access.redhat.com/errata/RHSA-2026:41055 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
go.dev/cl/767860 [email protected] go.dev Patch
pkg.go.dev/vuln/GO-2026-4981 [email protected] pkg.go.dev Vendor Advisory
access.redhat.com/errata/RHSA-2026:33120 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:41030 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
groups.google.com/g/golang-announce/c/qcCIEXso47M [email protected] groups.google.com Mailing List, Third Party Advisory
access.redhat.com/errata/RHSA-2026:36625 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:46885 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36648 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:36796 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33142 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42240 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
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access.redhat.com/errata/RHSA-2026:41019 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:39810 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:48151 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:42151 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/security/cve/CVE-2026-33811 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33150 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:33574 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
access.redhat.com/errata/RHSA-2026:40119 MITRE access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: hamayanhamayan (en)

Additional Advisory Data

SourceTimeEvent
ADP2026-05-07T20:01:34.913ZReported to Red Hat.
ADP2026-05-07T19:41:19.285ZMade public.

Solutions

ADP: RHSA-2026:42079: Red Hat Ansible Automation Platform 2.6 for RHEL 10, Red Hat Ansible Automation Platform 2.6 for RHEL 9

ADP: RHSA-2026:41019: RHEM 1.1 for RHEL 10, RHEM 1.1 for RHEL 9

ADP: RHSA-2026:42078: Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9

ADP: RHSA-2026:42082: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9

ADP: RHSA-2026:48151: Cryostat 4 on RHEL 9

ADP: RHSA-2026:36796: RHEM 1.0 for RHEL 9

ADP: RHSA-2026:39810: 9Base-RHOSO-TOOLS-18, Red Hat OpenStack Services on OpenShift 18.0

ADP: RHSA-2026:42150: Red Hat Satellite 6.17 for RHEL 9

ADP: RHSA-2026:42151: Red Hat Satellite 6.18 for RHEL 9

ADP: RHSA-2026:42240: Red Hat Satellite 6.19 for RHEL 9

ADP: RHSA-2026:39272: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:35832: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:34357: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:42946: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:39573: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)

ADP: RHSA-2026:38504: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:39266: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:36776: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:39319: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:36617: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:34359: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:47952: Logging Subsystem for Red Hat OpenShift 6.2

ADP: RHSA-2026:34364: Logging for Red Hat OpenShift 6.4

ADP: RHSA-2026:41030: Multicluster Global Hub 1.4.5

ADP: RHSA-2026:44622: Multicluster Global Hub 1.6.2

ADP: RHSA-2026:47149: Multicluster Global Hub 1.7.2

ADP: RHSA-2026:43692: OpenShift API for Data Protection 1.6

ADP: RHSA-2026:36625: Red Hat Advanced Cluster Security for Kubernetes 4.10

ADP: RHSA-2026:36207: Red Hat Advanced Cluster Security for Kubernetes 4.11

ADP: RHSA-2026:36319: Red Hat Advanced Cluster Security for Kubernetes 4.9

ADP: RHSA-2026:42132: Red Hat Ansible Automation Platform 2.6

ADP: RHSA-2026:33574: Red Hat Developer Hub 1.9

ADP: RHSA-2026:36651: Red Hat Edge Manager 1.0

ADP: RHSA-2026:40945: Red Hat Edge Manager 1.1

ADP: RHSA-2026:40118: Red Hat Edge Manager 1.1

ADP: RHSA-2026:23262: Red Hat Hardened Images

ADP: RHSA-2026:23264: Red Hat Hardened Images

ADP: RHSA-2026:41928: Red Hat Migration Toolkit 1.8

ADP: RHSA-2026:43038: Red Hat Migration Toolkit for Applications 8.2

ADP: RHSA-2026:42644: Red Hat OpenShift AI 2.25

ADP: RHSA-2026:36648: Red Hat OpenShift Builds 1.7.4

ADP: RHSA-2026:35994: Red Hat OpenShift GitOps 1.19

ADP: RHSA-2026:35993: Red Hat OpenShift GitOps 1.20

ADP: RHSA-2026:35995: Red Hat OpenShift GitOps 1.21

ADP: RHSA-2026:33120: Red Hat OpenShift Service Mesh 3.0

ADP: RHSA-2026:33123: Red Hat OpenShift Service Mesh 3.1

ADP: RHSA-2026:33142: Red Hat OpenShift Service Mesh 3.2

ADP: RHSA-2026:33150: Red Hat OpenShift Service Mesh 3.3

ADP: RHSA-2026:36797: Red Hat Trusted Artifact Signer 1.4

ADP: RHSA-2026:42043: Red Hat Web Terminal 1.11

ADP: RHSA-2026:42047: Red Hat Web Terminal 1.12

ADP: RHSA-2026:42050: Red Hat Web Terminal 1.13

ADP: RHSA-2026:42051: Red Hat Web Terminal 1.14

ADP: RHSA-2026:42049: Red Hat Web Terminal 1.15

ADP: RHSA-2026:42048: Red Hat Web Terminal 1.16

ADP: RHSA-2026:42852: Red Hat multicluster global hub 1.5.0

ADP: RHSA-2026:46885: multicluster engine for Kubernetes 2.10

ADP: RHSA-2026:41055: multicluster engine for Kubernetes 2.6

ADP: RHSA-2026:47735: multicluster engine for Kubernetes 2.8

Workarounds

ADP: To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment.

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