{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73283.json" } ], "title": "openssh: OpenSSH: Tunnel forwarding restriction bypass", "tracking": { "current_release_date": "2026-08-19T17:49:59+00:00", "generator": { "date": "2026-08-19T17:49:59+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.16" } }, "id": "CVE-2026-73283", "initial_release_date": "2026-08-11T19:15:24.335000+00:00", 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"name": "openssh-askpass as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:openssh-askpass" }, "product_reference": "openssh-askpass", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "openssh-clients as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:openssh-clients" }, "product_reference": "openssh-clients", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "openssh-keycat as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:openssh-keycat" }, "product_reference": "openssh-keycat", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "openssh-server as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:openssh-server" }, "product_reference": "openssh-server", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "openssh.src as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:openssh.src" }, "product_reference": "openssh.src", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "pam_ssh_agent_auth as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:pam_ssh_agent_auth" }, "product_reference": "pam_ssh_agent_auth", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "openssh.src as a component of Red Hat Hardened Images", "product_id": "red_hat_hardened_images:openssh.src" }, "product_reference": "openssh.src", "relates_to_product_reference": "red_hat_hardened_images" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-73283", "cwe": { "id": "CWE-305", "name": "Authentication Bypass by Primary Weakness" }, "discovery_date": "2026-08-11T19:31:05.763903+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2514321" } ], "notes": [ { "category": "description", "text": "A flaw was found in OpenSSH's `sshd` component. The `restrict` keyword, designed to limit tunnel forwarding within the `authorized_keys` file, was not correctly enforced for tunnel forwarding. This issue could allow a local attacker to bypass intended security restrictions, potentially leading to unauthorized network access or resource usage through tunnels.", "title": "Vulnerability description" }, { "category": "summary", "text": "openssh: OpenSSH: Tunnel forwarding restriction bypass", "title": "Vulnerability summary" }, { "category": "other", "text": "An authorization bypass flaw was found in OpenSSH's sshd daemon. When processing SSH public key authentication, sshd fails to enforce the restrict keyword in authorized_keys against TUN/TAP tunnel forwarding requests. An authenticated user holding a restricted key can still establish virtual network interface tunnels if tunnel forwarding is globally enabled on the server. This allows authorized users to bypass intended per-key restriction policies, posing a Moderate impact to confidentiality and integrity.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "known_affected": [ "red_hat_enterprise_linux_10:openssh", "red_hat_enterprise_linux_10:openssh-askpass", "red_hat_enterprise_linux_10:openssh-clients", "red_hat_enterprise_linux_10:openssh-keycat", "red_hat_enterprise_linux_10:openssh-keysign", "red_hat_enterprise_linux_10:openssh-server", "red_hat_enterprise_linux_10:openssh.src", "red_hat_enterprise_linux_6:openssh", "red_hat_enterprise_linux_6:openssh-askpass", "red_hat_enterprise_linux_6:openssh-clients", "red_hat_enterprise_linux_6:openssh-ldap", "red_hat_enterprise_linux_6:openssh-server", "red_hat_enterprise_linux_6:openssh.src", "red_hat_enterprise_linux_6:pam_ssh_agent_auth", "red_hat_enterprise_linux_7:openssh", "red_hat_enterprise_linux_7:openssh-askpass", "red_hat_enterprise_linux_7:openssh-cavs", "red_hat_enterprise_linux_7:openssh-clients", "red_hat_enterprise_linux_7:openssh-keycat", "red_hat_enterprise_linux_7:openssh-ldap", "red_hat_enterprise_linux_7:openssh-server", "red_hat_enterprise_linux_7:openssh-server-sysvinit", "red_hat_enterprise_linux_7:openssh.src", "red_hat_enterprise_linux_7:pam_ssh_agent_auth", "red_hat_enterprise_linux_8:openssh", "red_hat_enterprise_linux_8:openssh-askpass", "red_hat_enterprise_linux_8:openssh-cavs", "red_hat_enterprise_linux_8:openssh-clients", "red_hat_enterprise_linux_8:openssh-keycat", "red_hat_enterprise_linux_8:openssh-ldap", "red_hat_enterprise_linux_8:openssh-server", "red_hat_enterprise_linux_8:openssh.src", "red_hat_enterprise_linux_8:pam_ssh_agent_auth", "red_hat_enterprise_linux_9:openssh", "red_hat_enterprise_linux_9:openssh-askpass", "red_hat_enterprise_linux_9:openssh-clients", "red_hat_enterprise_linux_9:openssh-keycat", "red_hat_enterprise_linux_9:openssh-server", "red_hat_enterprise_linux_9:openssh.src", "red_hat_enterprise_linux_9:pam_ssh_agent_auth", "red_hat_hardened_images:openssh.src" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-73283" }, { "category": "external", "summary": "RHBZ#2514321", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514321" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-73283", "url": "https://www.cve.org/CVERecord?id=CVE-2026-73283" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-73283", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73283" }, { "category": "external", "summary": "https://www.openssh.org/releasenotes.html#10.5", "url": "https://www.openssh.org/releasenotes.html#10.5" } ], "release_date": "2026-08-11T19:15:24.335000+00:00", "remediations": [ { "category": "workaround", "details": "Set PermitTunnel no in /etc/ssh/sshd_config to disable TUN/TAP tunnel forwarding server-wide. Alternatively, restrict tunnel permissions for specific users or groups using Match blocks in sshd_config or explicit no-tun directives in authorized_keys.", "product_ids": [ "red_hat_enterprise_linux_10:openssh", "red_hat_enterprise_linux_10:openssh-askpass", "red_hat_enterprise_linux_10:openssh-clients", "red_hat_enterprise_linux_10:openssh-keycat", "red_hat_enterprise_linux_10:openssh-keysign", "red_hat_enterprise_linux_10:openssh-server", "red_hat_enterprise_linux_10:openssh.src", "red_hat_enterprise_linux_6:openssh", "red_hat_enterprise_linux_6:openssh-askpass", "red_hat_enterprise_linux_6:openssh-clients", "red_hat_enterprise_linux_6:openssh-ldap", "red_hat_enterprise_linux_6:openssh-server", "red_hat_enterprise_linux_6:openssh.src", "red_hat_enterprise_linux_6:pam_ssh_agent_auth", "red_hat_enterprise_linux_7:openssh", "red_hat_enterprise_linux_7:openssh-askpass", "red_hat_enterprise_linux_7:openssh-cavs", "red_hat_enterprise_linux_7:openssh-clients", "red_hat_enterprise_linux_7:openssh-keycat", "red_hat_enterprise_linux_7:openssh-ldap", "red_hat_enterprise_linux_7:openssh-server", "red_hat_enterprise_linux_7:openssh-server-sysvinit", "red_hat_enterprise_linux_7:openssh.src", "red_hat_enterprise_linux_7:pam_ssh_agent_auth", "red_hat_enterprise_linux_8:openssh", "red_hat_enterprise_linux_8:openssh-askpass", "red_hat_enterprise_linux_8:openssh-cavs", "red_hat_enterprise_linux_8:openssh-clients", "red_hat_enterprise_linux_8:openssh-keycat", "red_hat_enterprise_linux_8:openssh-ldap", "red_hat_enterprise_linux_8:openssh-server", "red_hat_enterprise_linux_8:openssh.src", "red_hat_enterprise_linux_8:pam_ssh_agent_auth", "red_hat_enterprise_linux_9:openssh", "red_hat_enterprise_linux_9:openssh-askpass", "red_hat_enterprise_linux_9:openssh-clients", "red_hat_enterprise_linux_9:openssh-keycat", "red_hat_enterprise_linux_9:openssh-server", "red_hat_enterprise_linux_9:openssh.src", "red_hat_enterprise_linux_9:pam_ssh_agent_auth", "red_hat_hardened_images:openssh.src" ] }, { "category": "none_available", "details": "Fix deferred", "product_ids": [ "red_hat_enterprise_linux_10:openssh", "red_hat_enterprise_linux_10:openssh-askpass", "red_hat_enterprise_linux_10:openssh-clients", "red_hat_enterprise_linux_10:openssh-keycat", "red_hat_enterprise_linux_10:openssh-keysign", "red_hat_enterprise_linux_10:openssh-server", "red_hat_enterprise_linux_10:openssh.src", "red_hat_enterprise_linux_6:openssh", "red_hat_enterprise_linux_6:openssh-askpass", "red_hat_enterprise_linux_6:openssh-clients", "red_hat_enterprise_linux_6:openssh-ldap", "red_hat_enterprise_linux_6:openssh-server", "red_hat_enterprise_linux_6:openssh.src", "red_hat_enterprise_linux_6:pam_ssh_agent_auth", "red_hat_enterprise_linux_7:openssh", "red_hat_enterprise_linux_7:openssh-askpass", "red_hat_enterprise_linux_7:openssh-cavs", "red_hat_enterprise_linux_7:openssh-clients", "red_hat_enterprise_linux_7:openssh-keycat", "red_hat_enterprise_linux_7:openssh-ldap", "red_hat_enterprise_linux_7:openssh-server", "red_hat_enterprise_linux_7:openssh-server-sysvinit", "red_hat_enterprise_linux_7:openssh.src", "red_hat_enterprise_linux_7:pam_ssh_agent_auth", "red_hat_enterprise_linux_8:openssh", "red_hat_enterprise_linux_8:openssh-askpass", "red_hat_enterprise_linux_8:openssh-cavs", "red_hat_enterprise_linux_8:openssh-clients", "red_hat_enterprise_linux_8:openssh-keycat", "red_hat_enterprise_linux_8:openssh-ldap", "red_hat_enterprise_linux_8:openssh-server", "red_hat_enterprise_linux_8:openssh.src", "red_hat_enterprise_linux_8:pam_ssh_agent_auth", "red_hat_enterprise_linux_9:openssh", "red_hat_enterprise_linux_9:openssh-askpass", "red_hat_enterprise_linux_9:openssh-clients", "red_hat_enterprise_linux_9:openssh-keycat", "red_hat_enterprise_linux_9:openssh-server", "red_hat_enterprise_linux_9:openssh.src", "red_hat_enterprise_linux_9:pam_ssh_agent_auth" ] }, { "category": "none_available", "details": "Affected", "product_ids": [ "red_hat_hardened_images:openssh.src" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "version": "3.1" }, "products": [ "red_hat_enterprise_linux_10:openssh", "red_hat_enterprise_linux_10:openssh-askpass", "red_hat_enterprise_linux_10:openssh-clients", "red_hat_enterprise_linux_10:openssh-keycat", "red_hat_enterprise_linux_10:openssh-keysign", "red_hat_enterprise_linux_10:openssh-server", "red_hat_enterprise_linux_10:openssh.src", "red_hat_enterprise_linux_6:openssh", "red_hat_enterprise_linux_6:openssh-askpass", "red_hat_enterprise_linux_6:openssh-clients", "red_hat_enterprise_linux_6:openssh-ldap", "red_hat_enterprise_linux_6:openssh-server", "red_hat_enterprise_linux_6:openssh.src", "red_hat_enterprise_linux_6:pam_ssh_agent_auth", "red_hat_enterprise_linux_7:openssh", "red_hat_enterprise_linux_7:openssh-askpass", "red_hat_enterprise_linux_7:openssh-cavs", "red_hat_enterprise_linux_7:openssh-clients", "red_hat_enterprise_linux_7:openssh-keycat", "red_hat_enterprise_linux_7:openssh-ldap", "red_hat_enterprise_linux_7:openssh-server", "red_hat_enterprise_linux_7:openssh-server-sysvinit", "red_hat_enterprise_linux_7:openssh.src", "red_hat_enterprise_linux_7:pam_ssh_agent_auth", "red_hat_enterprise_linux_8:openssh", "red_hat_enterprise_linux_8:openssh-askpass", "red_hat_enterprise_linux_8:openssh-cavs", "red_hat_enterprise_linux_8:openssh-clients", "red_hat_enterprise_linux_8:openssh-keycat", "red_hat_enterprise_linux_8:openssh-ldap", "red_hat_enterprise_linux_8:openssh-server", "red_hat_enterprise_linux_8:openssh.src", "red_hat_enterprise_linux_8:pam_ssh_agent_auth", "red_hat_enterprise_linux_9:openssh", "red_hat_enterprise_linux_9:openssh-askpass", "red_hat_enterprise_linux_9:openssh-clients", "red_hat_enterprise_linux_9:openssh-keycat", "red_hat_enterprise_linux_9:openssh-server", "red_hat_enterprise_linux_9:openssh.src", "red_hat_enterprise_linux_9:pam_ssh_agent_auth", "red_hat_hardened_images:openssh.src" ] } ], "threats": [ { "category": "impact", "details": "Moderate", "product_ids": [ "red_hat_enterprise_linux_10:openssh", "red_hat_enterprise_linux_10:openssh-askpass", "red_hat_enterprise_linux_10:openssh-clients", "red_hat_enterprise_linux_10:openssh-keycat", "red_hat_enterprise_linux_10:openssh-keysign", "red_hat_enterprise_linux_10:openssh-server", "red_hat_enterprise_linux_10:openssh.src", "red_hat_enterprise_linux_6:openssh", "red_hat_enterprise_linux_6:openssh-askpass", "red_hat_enterprise_linux_6:openssh-clients", "red_hat_enterprise_linux_6:openssh-ldap", "red_hat_enterprise_linux_6:openssh-server", "red_hat_enterprise_linux_6:openssh.src", "red_hat_enterprise_linux_6:pam_ssh_agent_auth", "red_hat_enterprise_linux_7:openssh", "red_hat_enterprise_linux_7:openssh-askpass", "red_hat_enterprise_linux_7:openssh-cavs", "red_hat_enterprise_linux_7:openssh-clients", "red_hat_enterprise_linux_7:openssh-keycat", "red_hat_enterprise_linux_7:openssh-ldap", "red_hat_enterprise_linux_7:openssh-server", "red_hat_enterprise_linux_7:openssh-server-sysvinit", "red_hat_enterprise_linux_7:openssh.src", "red_hat_enterprise_linux_7:pam_ssh_agent_auth", "red_hat_enterprise_linux_8:openssh", "red_hat_enterprise_linux_8:openssh-askpass", "red_hat_enterprise_linux_8:openssh-cavs", "red_hat_enterprise_linux_8:openssh-clients", "red_hat_enterprise_linux_8:openssh-keycat", "red_hat_enterprise_linux_8:openssh-ldap", "red_hat_enterprise_linux_8:openssh-server", "red_hat_enterprise_linux_8:openssh.src", "red_hat_enterprise_linux_8:pam_ssh_agent_auth", "red_hat_enterprise_linux_9:openssh", "red_hat_enterprise_linux_9:openssh-askpass", "red_hat_enterprise_linux_9:openssh-clients", "red_hat_enterprise_linux_9:openssh-keycat", "red_hat_enterprise_linux_9:openssh-server", "red_hat_enterprise_linux_9:openssh.src", "red_hat_enterprise_linux_9:pam_ssh_agent_auth", "red_hat_hardened_images:openssh.src" ] } ], "title": "openssh: OpenSSH: Tunnel forwarding restriction bypass" } ] }