CVE-2026-39821 (GCVE-0-2026-39821)

Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-07-10 12:05
VLAI
Title
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
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".
Severity
9.6 (Critical)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
8.2 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
Go
References
URL Tags
https://go.dev/cl/767220
https://go.dev/issue/78760
https://groups.google.com/g/golang-announce/c/iI-…
https://pkg.go.dev/vuln/GO-2026-5026
https://access.redhat.com/security/cve/CVE-2026-39821 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:34789 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36796 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30855 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35827 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35826 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34357 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30853 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35830 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35831 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30854 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35828 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35829 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34359 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34342 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36808 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34364 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30651 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26547 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36207 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:26546 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36651 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33531 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33524 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23262 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:23264 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36648 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36820 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35994 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35993 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33155 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33163 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33173 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33183 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33160 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:37387 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36797 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36105 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36167 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:30650 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36883 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
golang.org/x/net golang.org/x/net/idna Affected: 0 , < 0.55.0 (semver)
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Red Hat Red Hat OpenShift Container Platform 4.22     cpe:/a:redhat:openshift:4.22::el8
    cpe:/a:redhat:openshift:4.22::el9
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Red Hat RHEM 1.0 for RHEL 9     cpe:/a:redhat:edge_manager:1.0::el9
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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. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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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 Cluster Observability Operator 1.5.0     cpe:/a:redhat:cluster_observability_operator:1.5::el9
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Red Hat DevWorkspace Operator 0.42     cpe:/a:redhat:devworkspace:0.42::el9
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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 Advanced Cluster Management for Kubernetes 2.13     cpe:/a:redhat:acm:2.13::el9
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.10     cpe:/a:redhat:advanced_cluster_security:4.10::el8
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.11     cpe:/a:redhat:advanced_cluster_security:4.11::el9
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.9     cpe:/a:redhat:advanced_cluster_security:4.9::el8
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Red Hat Red Hat Edge Manager 1.0     cpe:/a:redhat:edge_manager:1.0::el9
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Red Hat Red Hat Enterprise Linux AI 3.4     cpe:/a:redhat:enterprise_linux_ai:3.4::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 Builds 1.7.4     cpe:/a:redhat:openshift_builds:1.7::el9
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Red Hat Red Hat OpenShift Dev Spaces 3.29     cpe:/a:redhat:openshift_devspaces:3.29::el9
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Red Hat Red Hat OpenShift GitOps 1.19     cpe:/a:redhat:openshift_gitops:1.19::el8
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Red Hat Red Hat OpenShift GitOps 1.20     cpe:/a:redhat:openshift_gitops:1.20::el9
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Red Hat Red Hat OpenShift Service Mesh 2.6     cpe:/a:redhat:service_mesh:2.6::el8
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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 Red Hat OpenShift Service Mesh 3     cpe:/a:redhat:service_mesh:3.0::el9
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Red Hat Red Hat Openshift Data Foundation 4.22     cpe:/a:redhat:openshift_data_foundation:4.22::el9
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Red Hat Red Hat Trusted Artifact Signer 1.4     cpe:/a:redhat:trusted_artifact_signer:1.4::el9
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Red Hat multicluster engine for Kubernetes 2.6     cpe:/a:redhat:multicluster_engine:2.6::el8
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Red Hat multicluster engine for Kubernetes 2.8     cpe:/a:redhat:multicluster_engine:2.8::el9
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Red Hat multicluster engine for Kubernetes 2.9     cpe:/a:redhat:multicluster_engine:2.9::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 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 Gatekeeper 3     cpe:/a:redhat:gatekeeper:3
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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 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 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 Ceph Storage 8     cpe:/a:redhat:ceph_storage:8
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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 Developer Hub     cpe:/a:redhat:rhdh: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 for Windows Containers     cpe:/a:redhat:windows_machine_config
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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 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 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 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 Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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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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Credits
KC1zs4 (https://github.com/KC1zs4)
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-39821",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-23T03:55:58.522682Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-1289",
                "description": "CWE-1289 Improper Validation of Unsafe Equivalence in Input",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-27T13:13:15.606Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "affected": [
          {
            "cpes": [
              "cpe:/a:redhat:openshift:4.22::el8",
              "cpe:/a:redhat:openshift:4.22::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Container Platform 4.22",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:edge_manager:1.0::el9"
            ],
            "defaultStatus": "affected",
            "product": "RHEM 1.0 for RHEL 9",
            "vendor": "Red Hat"
          },
          {
            "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:devworkspace:0.42::el9"
            ],
            "defaultStatus": "affected",
            "product": "DevWorkspace Operator 0.42",
            "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:4.11::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Advanced Cluster Security for Kubernetes 4.11",
            "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:edge_manager:1.0::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Edge Manager 1.0",
            "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:openshift_builds:1.7::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Builds 1.7.4",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_devspaces:3.29::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Dev Spaces 3.29",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_gitops:1.19::el8"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift GitOps 1.19",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_gitops:1.20::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift GitOps 1.20",
            "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:3.1::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:service_mesh:3.0::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat OpenShift Service Mesh 3",
            "vendor": "Red Hat"
          },
          {
            "cpes": [
              "cpe:/a:redhat:openshift_data_foundation:4.22::el9"
            ],
            "defaultStatus": "affected",
            "product": "Red Hat Openshift Data Foundation 4.22",
            "vendor": "Red Hat"
          },
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            "url": "https://access.redhat.com/errata/RHSA-2026:36167"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:30650"
          },
          {
            "tags": [
              "vendor-advisory",
              "x_refsource_REDHAT"
            ],
            "url": "https://access.redhat.com/errata/RHSA-2026:36883"
          }
        ],
        "solutions": [
          {
            "lang": "en",
            "value": "RHSA-2026:34789: Red Hat OpenShift Container Platform 4.22"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36796: RHEM 1.0 for RHEL 9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30855: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35827: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35826: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34357: Red Hat Enterprise Linux AppStream (v. 10)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30853: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35830: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35831: Red Hat Enterprise Linux AppStream (v. 8)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30854: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35828: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35829: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34359: Red Hat Enterprise Linux AppStream (v. 9)"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34342: Cluster Observability Operator 1.5.0"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36808: DevWorkspace Operator 0.42"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:34364: Logging Subsystem for Red Hat OpenShift 6.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30651: Red Hat Advanced Cluster Management for Kubernetes 2.13"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26547: Red Hat Advanced Cluster Security for Kubernetes 4.10"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36207: Red Hat Advanced Cluster Security for Kubernetes 4.11"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:26546: Red Hat Advanced Cluster Security for Kubernetes 4.9"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36651: Red Hat Edge Manager 1.0"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33531: Red Hat Enterprise Linux AI 3.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33524: Red Hat Enterprise Linux AI 3.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23262: Red Hat Hardened Images"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:23264: Red Hat Hardened Images"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36648: Red Hat OpenShift Builds 1.7.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36820: Red Hat OpenShift Dev Spaces 3.29"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35994: Red Hat OpenShift GitOps 1.19"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:35993: Red Hat OpenShift GitOps 1.20"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33155: Red Hat OpenShift Service Mesh 2.6"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33163: Red Hat OpenShift Service Mesh 3.1"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33173: Red Hat OpenShift Service Mesh 3.2"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33183: Red Hat OpenShift Service Mesh 3.3"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:33160: Red Hat OpenShift Service Mesh 3"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:37387: Red Hat Openshift Data Foundation 4.22"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36797: Red Hat Trusted Artifact Signer 1.4"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36105: multicluster engine for Kubernetes 2.6"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36167: multicluster engine for Kubernetes 2.6"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:30650: multicluster engine for Kubernetes 2.8"
          },
          {
            "lang": "en",
            "value": "RHSA-2026:36883: multicluster engine for Kubernetes 2.9"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-22T16:00:52.844Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-22T15:01:21.462Z",
            "value": "Made public."
          }
        ],
        "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
        "workarounds": [
          {
            "lang": "en",
            "value": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
        }
      }
    ],
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "KC1zs4 (https://github.com/KC1zs4)"
        }
      ],
      "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\"."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-1289: Improper Validation of Unsafe Equivalence in Input",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.462Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/767220"
        },
        {
          "url": "https://go.dev/issue/78760"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
        }
      ],
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-39821",
    "datePublished": "2026-05-22T15:01:21.462Z",
    "dateReserved": "2026-04-07T18:13:03.526Z",
    "dateUpdated": "2026-07-10T12:05:36.478Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-39821",
      "date": "2026-07-12",
      "epss": "0.00478",
      "percentile": "0.37973"
    },
    "microsoft_vex": {
      "current_release_date": "2026-06-19T14:40:22.000Z",
      "cve": "CVE-2026-39821",
      "id": "msrc_CVE-2026-39821",
      "initial_release_date": "2026-05-02T00:00:00.000Z",
      "product_status:fixed": "50",
      "product_status:known_affected": "52",
      "product_status:known_not_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-39821.json",
      "version": "11"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-39821\",\"sourceIdentifier\":\"security@golang.org\",\"published\":\"2026-05-22T16:16:20.410\",\"lastModified\":\"2026-07-10T12:16:44.313\",\"vulnStatus\":\"Modified\",\"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\\\".\"}],\"affected\":[{\"source\":\"security@golang.org\",\"affectedData\":[{\"vendor\":\"golang.org/x/net\",\"product\":\"golang.org/x/net/idna\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://pkg.go.dev\",\"packageName\":\"golang.org/x/net/idna\",\"programRoutines\":[{\"name\":\"Profile.process\"},{\"name\":\"Profile.ToASCII\"},{\"name\":\"Profile.ToUnicode\"},{\"name\":\"ToASCII\"},{\"name\":\"ToUnicode\"}],\"versions\":[{\"version\":\"0\",\"lessThan\":\"0.55.0\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red Hat\",\"product\":\"Red Hat OpenShift Container Platform 4.22\",\"defaultStatus\":\"affected\",\"cpes\":[\"cpe:/a:redhat:openshift:4.22::el8\",\"cpe:/a:redhat:openshift:4.22::el9\"]},{\"vendor\":\"Red Hat\",\"product\":\"RHEM 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      "cve": "CVE-2026-39821",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39821.json",
      "version": "3"
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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\\\".\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"CWE-1289: Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"shortName\": \"Go\", \"dateUpdated\": \"2026-05-22T15:01:21.462Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-39821\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-10T12:05:36.478Z\", \"dateReserved\": \"2026-04-07T18:13:03.526Z\", \"assignerOrgId\": \"1bb62c36-49e3-4200-9d77-64a1400537cc\", \"datePublished\": \"2026-05-22T15:01:21.462Z\", \"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.