openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options

A flaw was found in sshd, the OpenSSH server daemon. When DisableForwarding=yes is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over PermitTunnel=yes. This allows a remote attacker to bypass intended security restrictions and establish a tunnel,...

openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options

A flaw was found in sshd, the OpenSSH server daemon. When DisableForwarding=yes is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over PermitTunnel=yes. This allows a remote attacker to bypass intended security restrictions and establish a tunnel,...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: openssh (UTSA-2026-104810)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-104810 advisory. In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not. Tenable has extracted the preceding...

JLSEC-2026-1323 In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over...

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.

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CVE-2026-59999

A flaw was found in sshd, the OpenSSH server daemon. When DisableForwarding=yes is configured to prevent network traffic forwarding, it incorrectly fails to take precedence over PermitTunnel=yes. This allows a remote attacker to bypass intended security restrictions and establish a tunnel,...

ALPINE-CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

DEBIAN-CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

AZL-92051 CVE-2026-59999 affecting package openssh for versions less than 9.8p1-9

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

CVE-2026-59999 affects OpenSSH sshd prior to 10.4, where the intended precedence of DisableForwarding=yes over PermitTunnel=yes did not hold. The available documents confirm the root cause is an ordering/precedence bug in sshd, but do not provide concrete details on affected product versions beyo...

EUVD-2026-42142

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

CVE-2026-59999: Use of Less Trusted Source

In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not...

PT-2026-56290

Name of the Vulnerable Software and Affected Versions OpenSSH versions prior to 10.4 Description In sshd, the configuration setting DisableForwarding=yes failed to take precedence over PermitTunnel=yes, allowing tunnel forwarding even when it should have been disabled. Recommendations Update to...

Linux: SSH PermitTunnel

PermitTunnel: Specifies whether tun device forwarding is allowed. The argument must be SPDX-FileCopyrightText: 2020 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only...