CVE-2026-59999
Received Received - Intake

SSH Tunnel Privilege Escalation in OpenSSH

Publication date: 2026-07-08

Last updated on: 2026-07-08

Assigner: MITRE

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

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Meta Information

Published
2026-07-08
Last Modified
2026-07-08
Generated
2026-07-08
AI Q&A
2026-07-08
EPSS Evaluated
N/A
NVD
CVE-2026-59999
EUVD
EUVD-2026-42142

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
openssh openssh to 10.4 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-348 The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack.

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Executive Summary

This vulnerability exists in the sshd component of OpenSSH versions before 10.4. The intended behavior was that the configuration setting DisableForwarding=yes should take precedence over PermitTunnel=yes, but due to the flaw, DisableForwarding did not override PermitTunnel as expected.

Impact Analysis

Because DisableForwarding was not properly enforced over PermitTunnel, an attacker might be able to establish tunnels or forwarding that should have been disabled. This could lead to unauthorized use of SSH tunneling capabilities, potentially allowing an attacker to bypass network restrictions or perform unauthorized actions.

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