CVE-2026-39821 (GCVE-0-2026-39821)
Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-07-10 12:05
VLAI
EPSS
VEX
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)
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Assigner
References
47 references
Impacted products
89 products
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/idna |
Affected:
0 , < 0.55.0
(semver)
|
|
| Red Hat | Red Hat OpenShift Container Platform 4.22 |
cpe:/a:redhat:openshift:4.22::el8 cpe:/a:redhat:openshift:4.22::el9 |
|
| Red Hat | RHEM 1.0 for RHEL 9 |
cpe:/a:redhat:edge_manager:1.0::el9 |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 10) |
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 8) |
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 9) |
cpe:/a:redhat:enterprise_linux:9::appstream |
|
| Red Hat | Cluster Observability Operator 1.5.0 |
cpe:/a:redhat:cluster_observability_operator:1.5::el9 |
|
| Red Hat | DevWorkspace Operator 0.42 |
cpe:/a:redhat:devworkspace:0.42::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift 6.4 |
cpe:/a:redhat:logging:6.4::el9 |
|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2.13 |
cpe:/a:redhat:acm:2.13::el9 |
|
| Red Hat | Red Hat Advanced Cluster Security for Kubernetes 4.10 |
cpe:/a:redhat:advanced_cluster_security:4.10::el8 |
|
| Red Hat | Red Hat Advanced Cluster Security for Kubernetes 4.11 |
cpe:/a:redhat:advanced_cluster_security:4.11::el9 |
|
| Red Hat | Red Hat Advanced Cluster Security for Kubernetes 4.9 |
cpe:/a:redhat:advanced_cluster_security:4.9::el8 |
|
| Red Hat | Red Hat Edge Manager 1.0 |
cpe:/a:redhat:edge_manager:1.0::el9 |
|
| Red Hat | Red Hat Enterprise Linux AI 3.4 |
cpe:/a:redhat:enterprise_linux_ai:3.4::el9 |
|
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1 |
|
| Red Hat | Red Hat OpenShift Builds 1.7.4 |
cpe:/a:redhat:openshift_builds:1.7::el9 |
|
| Red Hat | Red Hat OpenShift Dev Spaces 3.29 |
cpe:/a:redhat:openshift_devspaces:3.29::el9 |
|
| Red Hat | Red Hat OpenShift GitOps 1.19 |
cpe:/a:redhat:openshift_gitops:1.19::el8 |
|
| Red Hat | Red Hat OpenShift GitOps 1.20 |
cpe:/a:redhat:openshift_gitops:1.20::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 2.6 |
cpe:/a:redhat:service_mesh:2.6::el8 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.1 |
cpe:/a:redhat:service_mesh:3.1::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.2 |
cpe:/a:redhat:service_mesh:3.2::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3.3 |
cpe:/a:redhat:service_mesh:3.3::el9 |
|
| Red Hat | Red Hat OpenShift Service Mesh 3 |
cpe:/a:redhat:service_mesh:3.0::el9 |
|
| Red Hat | Red Hat Openshift Data Foundation 4.22 |
cpe:/a:redhat:openshift_data_foundation:4.22::el9 |
|
| Red Hat | Red Hat Trusted Artifact Signer 1.4 |
cpe:/a:redhat:trusted_artifact_signer:1.4::el9 |
|
| Red Hat | multicluster engine for Kubernetes 2.6 |
cpe:/a:redhat:multicluster_engine:2.6::el8 |
|
| Red Hat | multicluster engine for Kubernetes 2.8 |
cpe:/a:redhat:multicluster_engine:2.8::el9 |
|
| Red Hat | multicluster engine for Kubernetes 2.9 |
cpe:/a:redhat:multicluster_engine:2.9::el9 |
|
| Red Hat | Assisted Installer for Red Hat OpenShift Container Platform 2 |
cpe:/a:redhat:assisted_installer:2 |
|
| Red Hat | cert-manager Operator for Red Hat OpenShift |
cpe:/a:redhat:cert_manager:1 |
|
| Red Hat | Compliance Operator |
cpe:/a:redhat:openshift_compliance_operator:1 |
|
| Red Hat | Confidential Compute Attestation |
cpe:/a:redhat:confidential_compute_attestation:1 |
|
| Red Hat | Deployment Validation Operator |
cpe:/a:redhat:deployment_validator_operator |
|
| Red Hat | External Secrets Operator for Red Hat OpenShift |
cpe:/a:redhat:external_secrets_operator:1 |
|
| Red Hat | Fence Agents Remediation Operator |
cpe:/a:redhat:workload_availability_far:0 |
|
| Red Hat | File Integrity Operator |
cpe:/a:redhat:openshift_file_integrity_operator:1 |
|
| Red Hat | Gatekeeper 3 |
cpe:/a:redhat:gatekeeper:3 |
|
| Red Hat | Logical Volume Manager Storage |
cpe:/a:redhat:lvms:4 |
|
| Red Hat | Machine Deletion Remediation Operator |
cpe:/a:redhat:workload_availability_mdr:0 |
|
| Red Hat | Migration Toolkit for Applications 8 |
cpe:/a:redhat:migration_toolkit_applications:8 |
|
| Red Hat | Migration Toolkit for Containers |
cpe:/a:redhat:rhmt:1 |
|
| Red Hat | Multiarch Tuning Operator |
cpe:/a:redhat:multiarch_tuning_operator |
|
| Red Hat | Multicluster Engine for Kubernetes |
cpe:/a:redhat:multicluster_engine |
|
| Red Hat | Multicluster Global Hub |
cpe:/a:redhat:multicluster_globalhub |
|
| Red Hat | Network Observability Operator |
cpe:/a:redhat:network_observ_optr:1 |
|
| Red Hat | Node HealthCheck Operator |
cpe:/a:redhat:workload_availability_nhc:0 |
|
| Red Hat | OpenShift API for Data Protection |
cpe:/a:redhat:openshift_api_data_protection:1 |
|
| Red Hat | OpenShift Developer Tools and Services |
cpe:/a:redhat:ocp_tools |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed |
|
| Red Hat | OpenShift Pipelines |
cpe:/a:redhat:openshift_pipelines:1 |
|
| Red Hat | OpenShift Serverless |
cpe:/a:redhat:serverless:1 |
|
| Red Hat | Power monitoring for Red Hat OpenShift |
cpe:/a:redhat:openshift_power_monitoring |
|
| Red Hat | Red Hat 3scale API Management Platform 2 |
cpe:/a:redhat:red_hat_3scale_amp:2 |
|
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 |
cpe:/a:redhat:acm:2 |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat Ceph Storage 5 |
cpe:/a:redhat:ceph_storage:5 |
|
| Red Hat | Red Hat Ceph Storage 6 |
cpe:/a:redhat:ceph_storage:6 |
|
| Red Hat | Red Hat Ceph Storage 8 |
cpe:/a:redhat:ceph_storage:8 |
|
| Red Hat | Red Hat Ceph Storage 9 |
cpe:/a:redhat:ceph_storage:9 |
|
| Red Hat | Red Hat Certification Program for Red Hat Enterprise Linux 9 |
cpe:/a:redhat:certifications:9 |
|
| Red Hat | Red Hat Connectivity Link 1 |
cpe:/a:redhat:connectivity_link:1 |
|
| Red Hat | Red Hat Developer Hub |
cpe:/a:redhat:rhdh:1 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux AI (RHEL AI) 3 |
cpe:/a:redhat:enterprise_linux_ai:3 |
|
| Red Hat | Red Hat Lightspeed for Runtimes Operator |
cpe:/a:redhat:lightspeed_for_runtimes:1 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat OpenShift Cluster Manager CLI |
cpe:/a:redhat:openshift_cluster_manager_cli:1 |
|
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4 |
|
| Red Hat | Red Hat OpenShift for Windows Containers |
cpe:/a:redhat:windows_machine_config |
|
| Red Hat | Red Hat OpenShift on AWS |
cpe:/a:redhat:openshift_service_on_aws:1 |
|
| Red Hat | Red Hat OpenShift Virtualization 4 |
cpe:/a:redhat:container_native_virtualization:4 |
|
| Red Hat | Red Hat OpenStack Platform 16.2 |
cpe:/a:redhat:openstack:16.2 |
|
| Red Hat | Red Hat OpenStack Platform 17.1 |
cpe:/a:redhat:openstack:17.1 |
|
| Red Hat | Red Hat Quay 3 |
cpe:/a:redhat:quay:3 |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
|
| Red Hat | Red Hat Web Terminal |
cpe:/a:redhat:webterminal:1 |
|
| Red Hat | Security Profiles Operator |
cpe:/a:redhat:openshift_security_profiles_operator:1 |
|
| Red Hat | streams for Apache Kafka 3 |
cpe:/a:redhat:amq_streams:3 |
|
| Red Hat | Zero Trust Workload Identity Manager |
cpe:/a:redhat:zero_trust_workload_identity_manager:1 |
|
| Red Hat | Zero Trust Workload Identity Manager - Tech Preview |
cpe:/a:redhat:zero_trust_workload_identity_manager:0 |
|
| Red Hat | Cryostat 4 |
cpe:/a:redhat:cryostat:4 |
|
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0 |
|
| Red Hat | Red Hat Service Interconnect 1 |
cpe:/a:redhat:service_interconnect:1 |
|
| Red Hat | Red Hat Service Interconnect 2 |
cpe:/a:redhat:service_interconnect:2 |
Credits
{
"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"
},
{
"cpes": [
"cpe:/a:redhat:trusted_artifact_signer:1.4::el9"
],
"defaultStatus": "affected",
"product": "Red Hat Trusted Artifact Signer 1.4",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:multicluster_engine:2.6::el8"
],
"defaultStatus": "affected",
"product": "multicluster engine for Kubernetes 2.6",
"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:multicluster_engine:2.9::el9"
],
"defaultStatus": "affected",
"product": "multicluster engine for Kubernetes 2.9",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat:assisted_installer:2"
],
"defaultStatus": "affected",
"product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
"vendor": "Red Hat"
},
{
"cpes": [
"cpe:/a:redhat: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: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": [
"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"
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"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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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-07-10T16:47:01+00:00",
"cve": "CVE-2026-39821",
"id": "CVE-2026-39821",
"initial_release_date": "2026-05-22T15:01:21.462000+00:00",
"product_status:fixed": "526",
"product_status:known_affected": "276",
"product_status:known_not_affected": "1001",
"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"
},
"vulnrichment": {
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\"https://access.redhat.com/errata/RHSA-2026:26546\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33531\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:33524\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:23262\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:23264\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36648\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:35994\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:35993\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": 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\"en\", \"value\": \"Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-08T12:05:44.075Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 9.6, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-39821\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-23T03:55:58.522682Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-1289\", \"description\": \"CWE-1289 Improper Validation of Unsafe Equivalence in Input\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-22T18:01:10.401Z\"}}], \"cna\": {\"title\": \"Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna\", \"credits\": [{\"lang\": \"en\", \"value\": \"KC1zs4 (https://github.com/KC1zs4)\"}], \"affected\": [{\"vendor\": \"golang.org/x/net\", \"product\": \"golang.org/x/net/idna\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"0.55.0\", \"versionType\": \"semver\"}], \"packageName\": \"golang.org/x/net/idna\", \"collectionURL\": \"https://pkg.go.dev\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"Profile.process\"}, {\"name\": \"Profile.ToASCII\"}, {\"name\": \"Profile.ToUnicode\"}, {\"name\": \"ToASCII\"}, {\"name\": \"ToUnicode\"}]}], \"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\"}], \"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\": [{\"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\": \"2026-07-08T12:05:44.075Z\", \"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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