FKIE_CVE-2026-39821

Vulnerability from fkie_nvd - Published: 2026-05-22 16:16 - Updated: 2026-07-02 12:17
Summary
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".
References
security@golang.orghttps://go.dev/cl/767220Issue Tracking
security@golang.orghttps://go.dev/issue/78760Issue Tracking
security@golang.orghttps://groups.google.com/g/golang-announce/c/iI-mYSI0lu8Mailing List
security@golang.orghttps://pkg.go.dev/vuln/GO-2026-5026Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23262
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:23264
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26546
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:26547
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30650
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30651
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30853
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30854
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:30855
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33155
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33160
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33163
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33173
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33183
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33524
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:33531
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34342
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34357
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34359
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/errata/RHSA-2026:34364
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://access.redhat.com/security/cve/CVE-2026-39821
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://bugzilla.redhat.com/show_bug.cgi?id=2480756
0b0ca135-0b70-47e7-9f44-1890c2a1c46chttps://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json
Impacted products
Vendor Product Version
golang net *

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/idna",
          "product": "golang.org/x/net/idna",
          "programRoutines": [
            {
              "name": "Profile.process"
            },
            {
              "name": "Profile.ToASCII"
            },
            {
              "name": "Profile.ToUnicode"
            },
            {
              "name": "ToASCII"
            },
            {
              "name": "ToUnicode"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "security@golang.org"
    },
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10.2"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 10)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:8::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 8)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux:9::appstream"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AppStream (v. 9)",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:cluster_observability_operator:1.5::el9"
          ],
          "defaultStatus": "affected",
          "product": "Cluster Observability Operator 1.5.0",
          "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:acm:2.13::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Advanced Cluster Management for Kubernetes 2.13",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:advanced_cluster_security:4.10::el8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Advanced Cluster Security for Kubernetes 4.10",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:advanced_cluster_security:4.9::el8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Advanced Cluster Security for Kubernetes 4.9",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:enterprise_linux_ai:3.4::el9"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Enterprise Linux AI 3.4",
          "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:2.6::el8"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Service Mesh 2.6",
          "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"
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          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Service Mesh 3.1",
          "vendor": "Red Hat"
        },
        {
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          ],
          "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:multicluster_engine:2.8::el9"
          ],
          "defaultStatus": "affected",
          "product": "multicluster engine for Kubernetes 2.8",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:assisted_installer:2"
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          "defaultStatus": "affected",
          "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
          "vendor": "Red Hat"
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        {
          "cpes": [
            "cpe:/a:redhat:openshift_builds:1"
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          "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: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: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: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:openshift_power_monitoring"
          ],
          "defaultStatus": "affected",
          "product": "Power monitoring for Red Hat OpenShift",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          "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": [
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          ],
          "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"
        },
        {
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            "cpe:/a:redhat:ceph_storage:6"
          ],
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          "product": "Red Hat Ceph Storage 6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
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          "product": "Red Hat Ceph Storage 8",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "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:rhdh:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Developer Hub",
          "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"
        },
        {
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          ],
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          "product": "Red Hat Enterprise Linux 7",
          "vendor": "Red Hat"
        },
        {
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          ],
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          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
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          ],
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          "product": "Red Hat Enterprise Linux 9",
          "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": [
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          ],
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          "product": "Red Hat OpenShift Container Platform 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
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          "product": "Red Hat OpenShift Dev Spaces",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift Dev Workspaces Operator",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:windows_machine_config"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift for Windows Containers",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openshift_gitops:1"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat OpenShift GitOps",
          "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:quay:3"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Quay 3",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:satellite:6"
          ],
          "defaultStatus": "affected",
          "product": "Red Hat Satellite 6",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
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          "product": "Red Hat Trusted Artifact Signer",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
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          ],
          "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: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:openshift_data_foundation:4"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Openshift Data Foundation 4",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:openstack:18.0"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat OpenStack Platform 18.0",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:service_interconnect:1"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Service Interconnect 1",
          "vendor": "Red Hat"
        },
        {
          "cpes": [
            "cpe:/a:redhat:service_interconnect:2"
          ],
          "defaultStatus": "unaffected",
          "product": "Red Hat Service Interconnect 2",
          "vendor": "Red Hat"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:golang:net:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "38C86E7B-A1CA-4670-B113-FC9585261F6F",
              "versionEndExcluding": "0.55.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode(\"xn--example-.com\") incorrectly returns the name \"example.com\" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject \"example.com\" but permit \"xn--example-.com\". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name \"example.com\"."
    }
  ],
  "id": "CVE-2026-39821",
  "lastModified": "2026-07-02T12:17:12.240",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.6,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 5.8,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.8,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-39821",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-23T03:55:58.522682Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-22T16:16:20.410",
  "references": [
    {
      "source": "security@golang.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://go.dev/cl/767220"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://go.dev/issue/78760"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Mailing List"
      ],
      "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
    },
    {
      "source": "security@golang.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://pkg.go.dev/vuln/GO-2026-5026"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/errata/RHSA-2026:23262"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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    },
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    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
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    },
    {
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    },
    {
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    },
    {
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    },
    {
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      "url": "https://access.redhat.com/errata/RHSA-2026:33163"
    },
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      "url": "https://access.redhat.com/errata/RHSA-2026:34357"
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      "url": "https://access.redhat.com/errata/RHSA-2026:34359"
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    {
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      "url": "https://access.redhat.com/errata/RHSA-2026:34364"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://access.redhat.com/security/cve/CVE-2026-39821"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480756"
    },
    {
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json"
    }
  ],
  "sourceIdentifier": "security@golang.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1289"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}


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Sightings

Author Source Type Date

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.


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