CVE-2026-33811 (GCVE-0-2026-33811)

Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-07-02 12:04
VLAI
Title
Crash when handling long CNAME response in net
Summary
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-415 - Double Free
  • CWE-1341 - Multiple Releases of Same Resource or Handle
Assigner
Go
References
Impacted products
Vendor Product Version
Go standard library net Affected: 0 , < 1.25.10 (semver)
Affected: 1.26.0-0 , < 1.26.3 (semver)
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Logging Subsystem for Red Hat OpenShift 6.4     cpe:/a:redhat:logging:6.4::el9
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Red Hat Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift Service Mesh 3.0     cpe:/a:redhat:service_mesh:3.0::el9
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Red Hat Red Hat OpenShift Service Mesh 3.1     cpe:/a:redhat:service_mesh:3.1::el9
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Red Hat Red Hat OpenShift Service Mesh 3.2     cpe:/a:redhat:service_mesh:3.2::el9
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Red Hat Red Hat OpenShift Service Mesh 3.3     cpe:/a:redhat:service_mesh:3.3::el9
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Red Hat Assisted Installer for Red Hat OpenShift Container Platform 2     cpe:/a:redhat:assisted_installer:2
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Red Hat Builds for Red Hat OpenShift     cpe:/a:redhat:openshift_builds:1
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Red Hat cert-manager Operator for Red Hat OpenShift     cpe:/a:redhat:cert_manager:1
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Red Hat Compliance Operator     cpe:/a:redhat:openshift_compliance_operator:1
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Red Hat Confidential Compute Attestation     cpe:/a:redhat:confidential_compute_attestation:1
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Red Hat Cryostat 4     cpe:/a:redhat:cryostat:4
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Red Hat Custom Metric Autoscaler operator for Red Hat Openshift     cpe:/a:redhat:openshift_custom_metrics_autoscaler:2
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Red Hat Deployment Validation Operator     cpe:/a:redhat:deployment_validator_operator
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Red Hat External Secrets Operator for Red Hat OpenShift     cpe:/a:redhat:external_secrets_operator:1
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Red Hat Fence Agents Remediation Operator     cpe:/a:redhat:workload_availability_far:0
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Red Hat File Integrity Operator     cpe:/a:redhat:openshift_file_integrity_operator:1
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Red Hat Gatekeeper 3     cpe:/a:redhat:gatekeeper:3
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Red Hat Logging Subsystem for Red Hat OpenShift     cpe:/a:redhat:logging:6
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Red Hat Logical Volume Manager Storage     cpe:/a:redhat:lvms:4
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Red Hat Machine Deletion Remediation Operator     cpe:/a:redhat:workload_availability_mdr:0
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Red Hat Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
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Red Hat Migration Toolkit for Containers     cpe:/a:redhat:rhmt:1
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Red Hat mirror registry for Red Hat OpenShift     cpe:/a:redhat:mirror_registry:1
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Red Hat mirror registry for Red Hat OpenShift 2     cpe:/a:redhat:mirror_registry:2
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Red Hat Multiarch Tuning Operator     cpe:/a:redhat:multiarch_tuning_operator
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Red Hat Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat Multicluster Global Hub     cpe:/a:redhat:multicluster_globalhub
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Red Hat Network Observability Operator     cpe:/a:redhat:network_observ_optr:1
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Red Hat Node HealthCheck Operator     cpe:/a:redhat:workload_availability_nhc:0
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Red Hat OpenShift API for Data Protection     cpe:/a:redhat:openshift_api_data_protection:1
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Red Hat OpenShift Developer Tools and Services     cpe:/a:redhat:ocp_tools
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Red Hat OpenShift Lightspeed     cpe:/a:redhat:openshift_lightspeed
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Red Hat OpenShift Pipelines     cpe:/a:redhat:openshift_pipelines:1
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Red Hat OpenShift Serverless     cpe:/a:redhat:serverless:1
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Red Hat OpenShift Source-to-Image (S2I)     cpe:/a:redhat:source_to_image:1
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Red Hat Power monitoring for Red Hat OpenShift     cpe:/a:redhat:openshift_power_monitoring
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Red Hat Red Hat Advanced Cluster Management for Kubernetes 2     cpe:/a:redhat:acm:2
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Red Hat Red Hat Advanced Cluster Security 4     cpe:/a:redhat:advanced_cluster_security:4
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat build of Apicurio Registry 2     cpe:/a:redhat:service_registry:2
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Red Hat Red Hat Ceph Storage 5     cpe:/a:redhat:ceph_storage:5
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Red Hat Red Hat Ceph Storage 6     cpe:/a:redhat:ceph_storage:6
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Red Hat Red Hat Ceph Storage 9     cpe:/a:redhat:ceph_storage:9
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Red Hat Red Hat Certification Program for Red Hat Enterprise Linux 9     cpe:/a:redhat:certifications:9
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Red Hat Red Hat Connectivity Link 1     cpe:/a:redhat:connectivity_link:1
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Red Hat Red Hat Edge Manager 1     cpe:/a:redhat:edge_manager:1
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3     cpe:/a:redhat:enterprise_linux_ai:3
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Red Hat Red Hat Lightspeed for Runtimes Operator     cpe:/a:redhat:lightspeed_for_runtimes:1
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Cluster Manager CLI     cpe:/a:redhat:openshift_cluster_manager_cli:1
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat Openshift Data Foundation 4     cpe:/a:redhat:openshift_data_foundation:4
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Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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Red Hat Red Hat OpenShift Dev Workspaces Operator     cpe:/a:redhat:devworkspace
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Red Hat Red Hat OpenShift distributed tracing 3     cpe:/a:redhat:openshift_distributed_tracing:3
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Red Hat Red Hat OpenShift for Windows Containers     cpe:/a:redhat:windows_machine_config
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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Red Hat Red Hat OpenShift on AWS     cpe:/a:redhat:openshift_service_on_aws:1
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat OpenStack Platform 16.2     cpe:/a:redhat:openstack:16.2
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Red Hat Red Hat OpenStack Platform 17.1     cpe:/a:redhat:openstack:17.1
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Red Hat Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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Red Hat Red Hat Quay 3     cpe:/a:redhat:quay:3
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Red Hat Service Interconnect 1     cpe:/a:redhat:service_interconnect:1
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Red Hat Red Hat Service Interconnect 2     cpe:/a:redhat:service_interconnect:2
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Red Hat Red Hat Trusted Artifact Signer     cpe:/a:redhat:trusted_artifact_signer:1
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Red Hat Red Hat Web Terminal     cpe:/a:redhat:webterminal:1
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Red Hat Security Profiles Operator     cpe:/a:redhat:openshift_security_profiles_operator:1
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Red Hat Service Telemetry Framework 1.5     cpe:/a:redhat:stf:1.5
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Red Hat streams for Apache Kafka 3     cpe:/a:redhat:amq_streams:3
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Red Hat Zero Trust Workload Identity Manager     cpe:/a:redhat:zero_trust_workload_identity_manager:1
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Red Hat Zero Trust Workload Identity Manager - Tech Preview     cpe:/a:redhat:zero_trust_workload_identity_manager:0
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Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh:2
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Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3
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Red Hat Red Hat 3scale API Management Platform 2     cpe:/a:redhat:red_hat_3scale_amp:2
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Red Hat Red Hat AMQ Clients     cpe:/a:redhat:amq_clients:2023
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Credits
hamayanhamayan
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    "adp": [
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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
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                "options": [
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                "role": "CISA Coordinator",
                "timestamp": "2026-05-08T14:25:39.702568Z",
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "affected": [
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            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10.2"
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            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AppStream (v. 10)",
            "vendor": "Red Hat"
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            "cpes": [
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            "product": "Red Hat Enterprise Linux AppStream (v. 9)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:logging:6.4::el9"
            ],
            "defaultStatus": "affected",
            "product": "Logging Subsystem for Red Hat OpenShift 6.4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhdh:1.9::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Developer Hub 1.9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:hummingbird:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Hardened Images",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:service_mesh:3.0::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Service Mesh 3.0",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:service_mesh:3.1::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Service Mesh 3.1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:service_mesh:3.2::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Service Mesh 3.2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:service_mesh:3.3::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Service Mesh 3.3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:assisted_installer:2"
            ],
            "defaultStatus": "affected",
            "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_builds:1"
            ],
            "defaultStatus": "affected",
            "product": "Builds for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:cert_manager:1"
            ],
            "defaultStatus": "affected",
            "product": "cert-manager Operator for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_compliance_operator:1"
            ],
            "defaultStatus": "affected",
            "product": "Compliance Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:confidential_compute_attestation:1"
            ],
            "defaultStatus": "affected",
            "product": "Confidential Compute Attestation",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:cryostat:4"
            ],
            "defaultStatus": "affected",
            "product": "Cryostat 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_custom_metrics_autoscaler:2"
            ],
            "defaultStatus": "affected",
            "product": "Custom Metric Autoscaler operator for Red Hat Openshift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:deployment_validator_operator"
            ],
            "defaultStatus": "affected",
            "product": "Deployment Validation Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:external_secrets_operator:1"
            ],
            "defaultStatus": "affected",
            "product": "External Secrets Operator for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:workload_availability_far:0"
            ],
            "defaultStatus": "affected",
            "product": "Fence Agents Remediation Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_file_integrity_operator:1"
            ],
            "defaultStatus": "affected",
            "product": "File Integrity Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:gatekeeper:3"
            ],
            "defaultStatus": "affected",
            "product": "Gatekeeper 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:logging:6"
            ],
            "defaultStatus": "affected",
            "product": "Logging Subsystem for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:lvms:4"
            ],
            "defaultStatus": "affected",
            "product": "Logical Volume Manager Storage",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:workload_availability_mdr:0"
            ],
            "defaultStatus": "affected",
            "product": "Machine Deletion Remediation Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:migration_toolkit_applications:8"
            ],
            "defaultStatus": "affected",
            "product": "Migration Toolkit for Applications 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:rhmt:1"
            ],
            "defaultStatus": "affected",
            "product": "Migration Toolkit for Containers",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:mirror_registry:1"
            ],
            "defaultStatus": "affected",
            "product": "mirror registry for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:mirror_registry:2"
            ],
            "defaultStatus": "affected",
            "product": "mirror registry for Red Hat OpenShift 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:multiarch_tuning_operator"
            ],
            "defaultStatus": "affected",
            "product": "Multiarch Tuning Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:multicluster_engine"
            ],
            "defaultStatus": "affected",
            "product": "Multicluster Engine for Kubernetes",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:multicluster_globalhub"
            ],
            "defaultStatus": "affected",
            "product": "Multicluster Global Hub",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:network_observ_optr:1"
            ],
            "defaultStatus": "affected",
            "product": "Network Observability Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:workload_availability_nhc:0"
            ],
            "defaultStatus": "affected",
            "product": "Node HealthCheck Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_api_data_protection:1"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift API for Data Protection",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ocp_tools"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Developer Tools and Services",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_lightspeed"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Lightspeed",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_pipelines:1"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Pipelines",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:serverless:1"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Serverless",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:source_to_image:1"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Source-to-Image (S2I)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_power_monitoring"
            ],
            "defaultStatus": "affected",
            "product": "Power monitoring for Red Hat OpenShift",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:acm:2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Advanced Cluster Management for Kubernetes 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:advanced_cluster_security:4"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Advanced Cluster Security 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ansible_automation_platform:2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Ansible Automation Platform 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:service_registry:2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat build of Apicurio Registry 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ceph_storage:5"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Ceph Storage 5",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ceph_storage:6"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Ceph Storage 6",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:ceph_storage:9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Ceph Storage 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:certifications:9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Certification Program for Red Hat Enterprise Linux 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:connectivity_link:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Connectivity Link 1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:edge_manager:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Edge Manager 1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:10"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux 10",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:7"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux 7",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux 8",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/o:redhat:enterprise_linux:9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux 9",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:enterprise_linux_ai:3"
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[{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-33811\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2467822\", \"name\": \"RHBZ#2467822\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33811.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:34357\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:34359\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:34364\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33574\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:23262\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:23264\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33120\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33123\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33142\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33150\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and a Denial of Service (DoS) for the affected application.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1341\", \"description\": \"Multiple Releases of Same Resource or Handle\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-02T12:04:50.996Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-33811\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-08T14:25:39.702568Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-08T14:25:36.174Z\"}}], \"cna\": {\"title\": \"Crash when handling long CNAME response in net\", \"credits\": [{\"lang\": \"en\", \"value\": \"hamayanhamayan\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"net\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.25.10\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.26.0-0\", \"lessThan\": \"1.26.3\", \"versionType\": \"semver\"}], \"packageName\": \"net\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"cgoResSearch\"}, {\"name\": \"LookupCNAME\"}, {\"name\": \"Resolver.LookupCNAME\"}]}], \"references\": [{\"url\": \"https://go.dev/issue/78803\"}, {\"url\": \"https://go.dev/cl/767860\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/qcCIEXso47M\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-4981\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-415: Double Free\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-07T19:41:19.285Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-33811\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-02T12:04:50.996Z\", \"dateReserved\": \"2026-03-23T20:35:32.814Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-07T19:41:19.285Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.