CVE-2026-27145 (GCVE-0-2026-27145)

Vulnerability from cvelistv5 – Published: 2026-06-02 22:01 – Updated: 2026-07-03 12:04
VLAI
Title
Inefficient candidate hostname parsing in crypto/x509
Summary
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname's label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
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: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-407 - Inefficient Algorithmic Complexity
  • CWE-606 - Unchecked Input for Loop Condition
Assigner
Go
References
Impacted products
Vendor Product Version
Go standard library crypto/x509 Affected: 0 , < 1.25.11 (semver)
Affected: 1.26.0-0 , < 1.26.4 (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 Red Hat Developer Hub 1.9     cpe:/a:redhat:rhdh:1.9::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 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 Machine Deletion Remediation Operator     cpe:/a:redhat:workload_availability_mdr:0
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Red Hat Migration Toolkit for Containers     cpe:/a:redhat:rhmt:1
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Red Hat Multiarch Tuning Operator     cpe:/a:redhat:multiarch_tuning_operator
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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 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 Service Mesh 3     cpe:/a:redhat:service_mesh:3
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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 3scale API Management Platform 2     cpe:/a:redhat:red_hat_3scale_amp:2
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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 Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform: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 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 Hardened Images     cpe:/a:redhat:hummingbird:1
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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 Dev Workspaces Operator     cpe:/a:redhat:devworkspace
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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 Satellite 6     cpe:/a:redhat:satellite:6
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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 streams for Apache Kafka 2     cpe:/a:redhat:amq_streams:2
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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 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 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 Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
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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 Multicluster Engine for Kubernetes     cpe:/a:redhat:multicluster_engine
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Red Hat OpenShift Developer Tools and Services     cpe:/a:redhat:ocp_tools
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Red Hat OpenShift Service Mesh 2     cpe:/a:redhat:service_mesh: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 Ceph Storage 7     cpe:/a:redhat:ceph_storage:7
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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 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 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 Quay 3     cpe:/a:redhat:quay:3
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Red Hat Red Hat Service Interconnect 2     cpe:/a:redhat:service_interconnect:2
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Red Hat Service Telemetry Framework 1.5     cpe:/a:redhat:stf:1.5
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Credits
Jakub Ciolek - https://ciolek.dev/
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            "product": "Confidential Compute Attestation",
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            "cpes": [
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            "product": "Deployment Validation Operator",
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            "cpes": [
              "cpe:/a:redhat:external_secrets_operator:1"
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            "cpes": [
              "cpe:/a:redhat:workload_availability_far:0"
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            "cpes": [
              "cpe:/a:redhat:openshift_file_integrity_operator:1"
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          },
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            "cpes": [
              "cpe:/a:redhat:workload_availability_mdr:0"
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            "defaultStatus": "affected",
            "product": "Machine Deletion Remediation Operator",
            "vendor": "Red Hat"
          },
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            "cpes": [
              "cpe:/a:redhat:rhmt:1"
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            "defaultStatus": "affected",
            "product": "Migration Toolkit for Containers",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:multiarch_tuning_operator"
            ],
            "defaultStatus": "affected",
            "product": "Multiarch Tuning Operator",
            "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"
            ],
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            "product": "Network Observability Operator",
            "vendor": "Red Hat"
          },
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            "cpes": [
              "cpe:/a:redhat:workload_availability_nhc:0"
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            "product": "Node HealthCheck Operator",
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            "cpes": [
              "cpe:/a:redhat:openshift_api_data_protection:1"
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            "cpes": [
              "cpe:/a:redhat:openshift_lightspeed"
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            "defaultStatus": "affected",
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          {
            "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:service_mesh:3"
            ],
            "defaultStatus": "affected",
            "product": "OpenShift Service Mesh 3",
            "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:red_hat_3scale_amp:2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat 3scale API Management Platform 2",
            "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:ansible_automation_platform:2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Ansible Automation Platform 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"
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            "defaultStatus": "affected",
            "product": "Red Hat Ceph Storage 6",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:connectivity_link:1"
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            "defaultStatus": "affected",
            "product": "Red Hat Connectivity Link 1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:edge_manager:1"
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            "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"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Enterprise Linux AI (RHEL AI) 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:hummingbird:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Hardened Images",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:lightspeed_for_runtimes:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Lightspeed for Runtimes Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_ai"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift AI (RHOAI)",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_cluster_manager_cli:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Cluster Manager CLI",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:devworkspace"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Dev Workspaces Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_service_on_aws:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift on AWS",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:container_native_virtualization:4"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Virtualization 4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openstack:16.2"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenStack Platform 16.2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openstack:17.1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenStack Platform 17.1",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openstack:18.0"
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            "defaultStatus": "affected",
            "product": "Red Hat OpenStack Platform 18.0",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:satellite:6"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Satellite 6",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:trusted_artifact_signer:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Trusted Artifact Signer",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:webterminal:1"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Web Terminal",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_security_profiles_operator:1"
            ],
            "defaultStatus": "affected",
            "product": "Security Profiles Operator",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_streams:2"
            ],
            "defaultStatus": "affected",
            "product": "streams for Apache Kafka 2",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:amq_streams:3"
            ],
            "defaultStatus": "affected",
            "product": "streams for Apache Kafka 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:zero_trust_workload_identity_manager:1"
            ],
            "defaultStatus": "affected",
            "product": "Zero Trust Workload Identity Manager",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:zero_trust_workload_identity_manager:0"
            ],
            "defaultStatus": "affected",
            "product": "Zero Trust Workload Identity Manager - Tech Preview",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:cryostat:4"
            ],
            "defaultStatus": "unaffected",
            "product": "Cryostat 4",
            "vendor": "Red Hat"
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            "value": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037)."
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          "value": "(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, \".\") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname\u0027s label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates."
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          "url": "https://go.dev/cl/783621"
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        {
          "url": "https://go.dev/issue/79694"
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          "url": "https://pkg.go.dev/vuln/GO-2026-5037"
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flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \\\".\\\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\\n\\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\\n\\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-606\", \"description\": \"Unchecked Input for Loop Condition\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-03T12:04:56.422Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 6.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-27145\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-04T12:34:03.859208Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-04T12:34:49.559Z\"}}], \"cna\": {\"title\": \"Inefficient candidate hostname parsing in crypto/x509\", \"credits\": [{\"lang\": \"en\", \"value\": \"Jakub Ciolek - https://ciolek.dev/\"}], \"affected\": [{\"vendor\": \"Go standard library\", \"product\": \"crypto/x509\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.25.11\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.26.0-0\", \"lessThan\": \"1.26.4\", \"versionType\": \"semver\"}], \"packageName\": \"crypto/x509\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"HostnameError.Error\"}, {\"name\": \"matchHostnames\"}, {\"name\": \"Certificate.Verify\"}, {\"name\": \"Certificate.VerifyHostname\"}]}], \"references\": [{\"url\": \"https://go.dev/cl/783621\"}, {\"url\": \"https://go.dev/issue/79694\"}, {\"url\": \"https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw\"}, {\"url\": \"https://pkg.go.dev/vuln/GO-2026-5037\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, \\\".\\\") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification costs scaled quadratically based on the number of SAN entries multiplied by the hostname\u0027s label count. Because x509.Verify validates hostnames before building the certificate chain, this overhead occurred even for untrusted certificates.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-407: Inefficient Algorithmic Complexity\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-06-02T22:01:36.954Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-27145\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-03T12:04:56.422Z\", \"dateReserved\": \"2026-02-17T19:57:28.435Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-06-02T22:01:36.954Z\", \"assignerShortName\": \"Go\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.