--- id: CVE-2026-78662 title: >- golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via channel request flooding (CVE-2026-78662) summary: >- A flaw was found in golang.org/x/crypto/ssh. A malicious remote attacker could flood a channel's incoming requests before it is established, leading to a deadlock of the entire connection. This could result in a denial of service (DoS) for… severity: medium cvss: 5.3 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L' cvssSource: vendor cwe: CWE-833 vendor: Red Hat product: Red Hat OpenShift Container Platform 4 affected: - assisted_installer_for_red_hat_openshift_container_platform 2 - builds_for_red_hat_openshift - confidential_compute_attestation - cryostat 4 - external_secrets_operator_for_red_hat_openshift - multicluster_engine_for_kubernetes - openshift_api_for_data_protection - openshift_pipelines - openshift_serverless - advanced_cluster_management_for_kubernetes 2 - advanced_cluster_security 4 - ceph_storage 8 - ceph_storage 9 - edge_manager 1 - enterprise_linux 10 - enterprise_linux 8 - enterprise_linux 9 - openshift_ai_rhoai - openshift_container_platform 4 - openshift_data_foundation 4 - openshift_dev_spaces - openshift_dev_workspaces_operator - openshift_for_windows_containers - openshift_gitops - openshift_on_aws - openshift_virtualization 4 - openstack_platform 16.2 - openstack_platform 17.1 - openstack_platform 18.0 - quay 3 - trusted_artifact_signer - security_profiles_operator - zero_trust_workload_identity_manager - zero_trust_workload_identity_manager_tech_preview - cert_manager_support_for_red_hat_openshift_release 1.17 patched: - cert_manager_support_for_red_hat_openshift_release 1.17 published: '2026-09-02' updated: '2026-10-14' sourceUpdated: '2026-10-14T03:25:07+00:00' source: CSAF sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78662.json' references: - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78662.json - url: 'https://access.redhat.com/security/cve/CVE-2026-78662' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2528026' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-78662' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78662' - url: 'https://go.dev/cl/826504' - url: 'https://go.dev/issue/81316' - url: 'https://groups.google.com/g/golang-announce/c/1y3fb2np35U' - url: 'https://pkg.go.dev/vuln/GO-2026-6354' - url: 'https://access.redhat.com/errata/RHSA-2026:82322' - url: 'https://access.redhat.com/errata/RHSA-2026:82304' tags: - csaf - vex - red-hat - osv - go epss: 0.00431 epssPercentile: 0.372 aliases: - GO-2026-6354 ecosystem: go ingestedAt: '2026-09-03T19:32:15.737Z' --- ## Overview A flaw was found in golang.org/x/crypto/ssh. A malicious remote attacker could flood a channel's incoming requests before it is established, leading to a deadlock of the entire connection. This could result in a denial of service (DoS) for legitimate users. ## Vendor advisories - **RHSA-2026:82322** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.17 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82322) - **RHSA-2026:82304** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.17 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82304) - **Red Hat VEX** · Moderate · affected: Assisted Installer for Red Hat OpenShift Container Platform 2, Builds for Red Hat OpenShift, Confidential Compute Attestation, Cryostat 4, External Secrets Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes, … · no fix planned: Red Hat Ceph Storage 9, Assisted Installer for Red Hat OpenShift Container Platform 2, Builds for Red Hat OpenShift, Confidential Compute Attestation, … · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78662.json) **golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via channel request flooding** — rated Moderate by Red Hat. Released 2026-09-02, updated 2026-10-14. Affected: - Assisted Installer for Red Hat OpenShift Container Platform 2 - Builds for Red Hat OpenShift - Confidential Compute Attestation - Cryostat 4 - External Secrets Operator for Red Hat OpenShift - Multicluster Engine for Kubernetes - OpenShift API for Data Protection - OpenShift Pipelines - OpenShift Serverless - Red Hat Advanced Cluster Management for Kubernetes 2 - Red Hat Advanced Cluster Security 4 - Red Hat Ceph Storage 8 - Red Hat Ceph Storage 9 - Red Hat Edge Manager 1 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces - Red Hat OpenShift Dev Workspaces Operator - Red Hat OpenShift for Windows Containers - Red Hat OpenShift GitOps - Red Hat OpenShift on AWS - Red Hat OpenShift Virtualization 4 - Red Hat OpenStack Platform 16.2 - Red Hat OpenStack Platform 17.1 - Red Hat OpenStack Platform 18.0 - Red Hat Quay 3 - Red Hat Trusted Artifact Signer - Security Profiles Operator - Zero Trust Workload Identity Manager - Zero Trust Workload Identity Manager - Tech Preview Fixed: - Cert Manager support for Red Hat OpenShift release 1.17 No fix planned: - Red Hat Ceph Storage 9 - Assisted Installer for Red Hat OpenShift Container Platform 2 - Builds for Red Hat OpenShift - Confidential Compute Attestation - Cryostat 4 - External Secrets Operator for Red Hat OpenShift - Multicluster Engine for Kubernetes - OpenShift API for Data Protection - OpenShift Pipelines - OpenShift Serverless - Red Hat Advanced Cluster Management for Kubernetes 2 - Red Hat Advanced Cluster Security 4 - Red Hat Ceph Storage 8 - Red Hat Edge Manager 1 - Red Hat Enterprise Linux 10 - Red Hat Enterprise Linux 8 - Red Hat Enterprise Linux 9 - Red Hat OpenShift AI (RHOAI) - Red Hat OpenShift Container Platform 4 - Red Hat Openshift Data Foundation 4 - Red Hat OpenShift Dev Spaces - Red Hat OpenShift Dev Workspaces Operator - Red Hat OpenShift for Windows Containers - Red Hat OpenShift GitOps - Red Hat OpenShift on AWS - Red Hat OpenShift Virtualization 4 - Red Hat OpenStack Platform 16.2 - Red Hat OpenStack Platform 17.1 - Red Hat OpenStack Platform 18.0 - Red Hat Quay 3 - Red Hat Trusted Artifact Signer - Security Profiles Operator - Zero Trust Workload Identity Manager - Zero Trust Workload Identity Manager - Tech Preview ## Remediation Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade… https://access.redhat.com/errata/RHSA-2026:82322 Before applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If the approval policy is set to `Automatic`, then the Operator will be upgraded automatically when there is a new version of the Operator. No further action is required to upgrade. This is the default setting. - If you changed the approval policy to `Manual`, then you must manually approve the upgrade… https://access.redhat.com/errata/RHSA-2026:82304 Workarounds / mitigations: - Red Hat is not aware of a practical mitigation that fully prevents this issue while maintaining affected SSH functionality. Where operationally possible, restrict SSH connectivity to trusted systems. Apply relevant Red Hat updates when they become available. ## Package advisory (CVE-2026-78662) Affected packages: - `golang.org/x/crypto < 0.56.0` Patched in: - `golang.org/x/crypto 0.56.0` Source: https://osv.dev/vulnerability/GO-2026-6354