{"id":"CVE-2026-39831","title":"golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Security key bypass due to missing user presence check (CVE-2026-39831)","summary":"A flaw was found in golang.org/x/crypto/ssh. The Verify() method, responsible for FIDO/U2F security key types, did not properly check for user presence. This allowed signatures to be accepted without requiring a physical touch on the hardw…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cvssSource":"vendor","cwe":["CWE-347","CWE-862"],"vendor":"Red Hat","product":"Red Hat Openshift Data Foundation 4.22","affected":["assisted_installer_for_red_hat_openshift_container_platform 2","builds_for_red_hat_openshift","cert_manager_operator_for_red_hat_openshift","confidential_compute_attestation","external_secrets_operator_for_red_hat_openshift","multicluster_engine_for_kubernetes","openshift_pipelines","openshift_serverless","advanced_cluster_management_for_kubernetes 2","advanced_cluster_security 4","ceph_storage 9","edge_manager 1","enterprise_linux 10","enterprise_linux 8","enterprise_linux 9","openshift_ai_rhoai","openshift_container_platform 4","openshift_dev_workspaces_operator","openshift_for_windows_containers","openshift_gitops","openshift_on_aws","openshift_virtualization 4","quay 3","trusted_artifact_signer","security_profiles_operator","zero_trust_workload_identity_manager","zero_trust_workload_identity_manager_tech_preview","rhem_1_1_for_rhel 10","rhem_1_1_for_rhel 9","enterprise_linux_appstream_eus_v_9_6","cluster_observability_operator 1.5.0","logging_subsystem_for_red_hat_openshift 6.6","openshift_api_for_data_protection 1.3","openshift_api_for_data_protection 1.4","openshift_api_for_data_protection 1.5","openshift_api_for_data_protection 1.6","advanced_cluster_management_for_kubernetes 2.16","advanced_cluster_security 4.9","advanced_cluster_security_for_kubernetes 4.10","openshift_ai 3.4"],"patched":["rhem_1_1_for_rhel 10","rhem_1_1_for_rhel 9","enterprise_linux_appstream_eus_v_9_6","cluster_observability_operator 1.5.0","logging_subsystem_for_red_hat_openshift 6.6","openshift_api_for_data_protection 1.3","openshift_api_for_data_protection 1.4","openshift_api_for_data_protection 1.5","openshift_api_for_data_protection 1.6","advanced_cluster_management_for_kubernetes 2.16","advanced_cluster_security 4.9","advanced_cluster_security_for_kubernetes 4.10","openshift_ai 3.4","openshift_container_platform 4.21","openshift_container_platform 4.22","openshift_dev_spaces 3.30","openshift_gitops 1.19","openshift_gitops 1.20","openshift_data_foundation 4.22","quay 3.10","quay 3.15","quay 3.16","quay 3.9","trusted_artifact_signer 1.3","trusted_artifact_signer 1.4","multicluster_engine_for_kubernetes 2.11","multicluster_engine_for_kubernetes 2.1","multicluster_engine_for_kubernetes 2.6","multicluster_engine_for_kubernetes 2.8","multicluster_engine_for_kubernetes 2.9"],"published":"2026-05-22","updated":"2026-09-17","sourceUpdated":"2026-09-17T11:55:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39831.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39831.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-39831"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2480675"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-39831"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39831"},{"url":"https://go.dev/cl/781662"},{"url":"https://go.dev/issue/79566"},{"url":"https://groups.google.com/g/golang-announce/c/a082jnz-LvI"},{"url":"https://pkg.go.dev/vuln/GO-2026-5019"},{"url":"https://access.redhat.com/errata/RHSA-2026:68334"},{"url":"https://access.redhat.com/errata/RHSA-2026:67450"},{"url":"https://access.redhat.com/errata/RHSA-2026:61314"},{"url":"https://access.redhat.com/errata/RHSA-2026:66521"},{"url":"https://access.redhat.com/errata/RHSA-2026:51033"},{"url":"https://access.redhat.com/errata/RHSA-2026:59467"},{"url":"https://access.redhat.com/errata/RHSA-2026:66022"},{"url":"https://access.redhat.com/errata/RHSA-2026:43692"},{"url":"https://access.redhat.com/errata/RHSA-2026:54400"},{"url":"https://access.redhat.com/errata/RHSA-2026:36319"},{"url":"https://access.redhat.com/errata/RHSA-2026:36625"},{"url":"https://access.redhat.com/errata/RHSA-2026:60520"},{"url":"https://access.redhat.com/errata/RHSA-2026:57801"},{"url":"https://access.redhat.com/errata/RHSA-2026:54770"},{"url":"https://access.redhat.com/errata/RHSA-2026:62260"},{"url":"https://access.redhat.com/errata/RHSA-2026:52857"},{"url":"https://access.redhat.com/errata/RHSA-2026:52910"},{"url":"https://access.redhat.com/errata/RHSA-2026:37387"},{"url":"https://access.redhat.com/errata/RHSA-2026:41031"},{"url":"https://access.redhat.com/errata/RHSA-2026:42796"},{"url":"https://access.redhat.com/errata/RHSA-2026:41066"},{"url":"https://access.redhat.com/errata/RHSA-2026:40262"},{"url":"https://access.redhat.com/errata/RHSA-2026:40972"},{"url":"https://access.redhat.com/errata/RHSA-2026:40974"},{"url":"https://access.redhat.com/errata/RHSA-2026:40969"},{"url":"https://github.com/advisories/GHSA-89gr-r52h-f8rx"}],"tags":["csaf","vex","red-hat","osv","go","ghsa"],"epss":0.0042,"epssPercentile":0.35995,"aliases":["GO-2026-5019","GHSA-89gr-r52h-f8rx"],"ecosystem":"go","ingestedAt":"2026-06-26T16:43:14.193Z","slug":"CVE-2026-39831","body":"## Overview\n\nA flaw was found in golang.org/x/crypto/ssh. The Verify() method, responsible for FIDO/U2F security key types, did not properly check for user presence. This allowed signatures to be accepted without requiring a physical touch on the hardware security key. As a result, an attacker could potentially use a hardware security key in an unattended manner, bypassing a critical security control designed to ensure user intent.\n\n## Vendor advisories\n\n- **RHSA-2026:68334** · Red Hat · fixed in: RHEM 1.1 for RHEL 10, RHEM 1.1 for RHEL 9 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68334)\n- **RHSA-2026:67450** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6) · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:67450)\n- **RHSA-2026:61314** · Red Hat · fixed in: Cluster Observability Operator 1.5.0 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61314)\n- **RHSA-2026:66521** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66521)\n- **RHSA-2026:51033** · Red Hat · fixed in: OpenShift API for Data Protection 1.3 · released 2026-08-06 · [advisory](https://access.redhat.com/errata/RHSA-2026:51033)\n- **RHSA-2026:59467** · Red Hat · fixed in: OpenShift API for Data Protection 1.4 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59467)\n- **RHSA-2026:66022** · Red Hat · fixed in: OpenShift API for Data Protection 1.5 · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:66022)\n- **RHSA-2026:43692** · Red Hat · fixed in: OpenShift API for Data Protection 1.6 · released 2026-07-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:43692)\n- **RHSA-2026:54400** · Red Hat · fixed in: Red Hat Advanced Cluster Management for Kubernetes 2.16 · released 2026-08-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:54400)\n- **RHSA-2026:36319** · Red Hat · fixed in: Red Hat Advanced Cluster Security 4.9 · released 2026-07-07 · [advisory](https://access.redhat.com/errata/RHSA-2026:36319)\n- **RHSA-2026:36625** · Red Hat · fixed in: Red Hat Advanced Cluster Security for Kubernetes 4.10 · released 2026-07-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:36625)\n- **Red Hat VEX** · Important · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, Builds for Red Hat OpenShift, cert-manager Operator for Red Hat OpenShift, Confidential Compute Attestation, External Secrets Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes, … · no fix planned: Confidential Compute Attestation, External Secrets Operator for Red Hat OpenShift, Red Hat OpenShift Container Platform 4, Zero Trust Workload Identity Manager - Tech Preview, … · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39831.json)\n- **RHSA-2026:60520** · Red Hat · fixed in: Red Hat OpenShift AI 3.4 · released 2026-08-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:60520)\n- **RHSA-2026:57801** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:57801)\n- **RHSA-2026:54770** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-08-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:54770)\n- **RHSA-2026:62260** · Red Hat · fixed in: Red Hat OpenShift Dev Spaces 3.30 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62260)\n\n**golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Security key bypass due to missing user presence check** — rated Important by Red Hat. Released 2026-05-22, updated 2026-09-17.\n\nAffected:\n\n- Assisted Installer for Red Hat OpenShift Container Platform 2\n- Builds for Red Hat OpenShift\n- cert-manager Operator for Red Hat OpenShift\n- Confidential Compute Attestation\n- External Secrets Operator for Red Hat OpenShift\n- Multicluster Engine for Kubernetes\n- OpenShift Pipelines\n- OpenShift Serverless\n- Red Hat Advanced Cluster Management for Kubernetes 2\n- Red Hat Advanced Cluster Security 4\n- Red Hat Ceph Storage 9\n- Red Hat Edge Manager 1\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Container Platform 4\n- Red Hat OpenShift Dev Workspaces Operator\n- Red Hat OpenShift for Windows Containers\n- Red Hat OpenShift GitOps\n- Red Hat OpenShift on AWS\n- Red Hat OpenShift Virtualization 4\n- Red Hat Quay 3\n- Red Hat Trusted Artifact Signer\n- Security Profiles Operator\n- Zero Trust Workload Identity Manager\n- Zero Trust Workload Identity Manager - Tech Preview\n\nFixed:\n\n- RHEM 1.1 for RHEL 10\n- RHEM 1.1 for RHEL 9\n- Red Hat Enterprise Linux AppStream EUS (v.9.6)\n- Cluster Observability Operator 1.5.0\n- Logging Subsystem for Red Hat OpenShift 6.6\n- OpenShift API for Data Protection 1.3\n- OpenShift API for Data Protection 1.4\n- OpenShift API for Data Protection 1.5\n- OpenShift API for Data Protection 1.6\n- Red Hat Advanced Cluster Management for Kubernetes 2.16\n- Red Hat Advanced Cluster Security 4.9\n- Red Hat Advanced Cluster Security for Kubernetes 4.10\n- Red Hat OpenShift AI 3.4\n- Red Hat OpenShift Container Platform 4.21\n- Red Hat OpenShift Container Platform 4.22\n- Red Hat OpenShift Dev Spaces 3.30\n- Red Hat OpenShift GitOps 1.19\n- Red Hat OpenShift GitOps 1.20\n- Red Hat Openshift Data Foundation 4.22\n- Red Hat Quay 3.10\n- Red Hat Quay 3.15\n- Red Hat Quay 3.16\n- Red Hat Quay 3.9\n- Red Hat Trusted Artifact Signer 1.3\n- Red Hat Trusted Artifact Signer 1.4\n- multicluster engine for Kubernetes 2.11\n- multicluster engine for Kubernetes 2.1\n- multicluster engine for Kubernetes 2.6\n- multicluster engine for Kubernetes 2.8\n- multicluster engine for Kubernetes 2.9\n\nNo fix planned:\n\n- Confidential Compute Attestation\n- External Secrets Operator for Red Hat OpenShift\n- Red Hat OpenShift Container Platform 4\n- Zero Trust Workload Identity Manager - Tech Preview\n- Red Hat Ceph Storage 9\n- Assisted Installer for Red Hat OpenShift Container Platform 2\n- Builds for Red Hat OpenShift\n- cert-manager Operator for Red Hat OpenShift\n- Multicluster Engine for Kubernetes\n- OpenShift Pipelines\n- OpenShift Serverless\n- Red Hat Advanced Cluster Management for Kubernetes 2\n- Red Hat Advanced Cluster Security 4\n- Red Hat Edge Manager 1\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Dev Workspaces Operator\n- Red Hat OpenShift for Windows Containers\n- Red Hat OpenShift GitOps\n- Red Hat OpenShift on AWS\n- Red Hat OpenShift Virtualization 4\n- Red Hat Quay 3\n- Red Hat Trusted Artifact Signer\n- Security Profiles Operator\n- Zero Trust Workload Identity Manager\n\nNot affected:\n\n- RHEM 1.1 for RHEL 10\n- RHEM 1.1 for RHEL 9\n- Cluster Observability Operator 1.5.0\n- Logging Subsystem for Red Hat OpenShift 6.6\n- OpenShift API for Data Protection 1.3\n- OpenShift API for Data Protection 1.4\n- OpenShift API for Data Protection 1.5\n- OpenShift API for Data Protection 1.6\n- Red Hat Advanced Cluster Management for Kubernetes 2.16\n- Red Hat Advanced Cluster Security 4.9\n\n## Remediation\n\nSee the following documentation for details on how to enable Red Hat Edge\nManager and more:\nhttps://docs.redhat.com/en/documentation/red_hat_edge_manager/1.1 https://access.redhat.com/errata/RHSA-2026:68334\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:67450\nBefore applying this update, make sure all previously released errata relevant to your system have been applied.\nFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2026:61314\n\n## Package advisory (CVE-2026-39831)\n\nAffected packages:\n\n- `golang.org/x/crypto < 0.52.0`\n\nPatched in:\n\n- `golang.org/x/crypto 0.52.0`\n\nSource: https://osv.dev/vulnerability/GO-2026-5019","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":5162,"id":"CVE-2026-39831","ts":1788887250953,"field":"cvss","old":"9.1","new":"8.1"},{"seq":5161,"id":"CVE-2026-39831","ts":1788887250953,"field":"severity","old":"critical","new":"high"},{"seq":4045,"id":"CVE-2026-39831","ts":1788886366864,"field":"cvss","old":"8.1","new":"9.1"},{"seq":4044,"id":"CVE-2026-39831","ts":1788886366864,"field":"severity","old":"high","new":"critical"},{"seq":3204,"id":"CVE-2026-39831","ts":1788883133657,"field":"cvss","old":"9.1","new":"8.1"},{"seq":3203,"id":"CVE-2026-39831","ts":1788883133657,"field":"severity","old":"critical","new":"high"}]}