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{"bugzilla": {"description": "openssh: OpenSSH: Tunnel forwarding restriction bypass", "id": "2514321", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514321"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-305", "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-73283", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Fix deferred", "package_name": "openssh", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-08-11T19:15:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-73283\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-73283\nhttps://www.openssh.org/releasenotes.html#10.5"], "statement": "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.", "threat_severity": "Moderate"}

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