CVE-2026-59999: CWE-348 Use of Less Trusted Source in OpenBSD OpenSSH
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
AI Analysis
Technical Summary
CVE-2026-59999 describes a vulnerability in the sshd component of OpenSSH versions prior to 10.4 where the configuration option DisableForwarding=yes was intended to override PermitTunnel=yes, but this precedence was not enforced. This flaw results in PermitTunnel being effective even when forwarding is supposed to be disabled, potentially allowing unauthorized forwarding through the SSH tunnel. The vulnerability is categorized under CWE-348, indicating a use of a less trusted source or control mechanism. No official remediation level or patch information is provided in the available data.
Potential Impact
The vulnerability impacts the integrity of the SSH service by allowing forwarding capabilities that should have been disabled, potentially enabling unauthorized data forwarding or tunneling. There is no indication of confidentiality or availability impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisories for current remediation guidance. Until an official fix is released, administrators should review and possibly restrict the use of PermitTunnel and DisableForwarding settings to minimize risk.
CVE-2026-59999: CWE-348 Use of Less Trusted Source in OpenBSD OpenSSH
Description
In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, but did not.
CVSS v3.1
Score 5.9medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-59999 describes a vulnerability in the sshd component of OpenSSH versions prior to 10.4 where the configuration option DisableForwarding=yes was intended to override PermitTunnel=yes, but this precedence was not enforced. This flaw results in PermitTunnel being effective even when forwarding is supposed to be disabled, potentially allowing unauthorized forwarding through the SSH tunnel. The vulnerability is categorized under CWE-348, indicating a use of a less trusted source or control mechanism. No official remediation level or patch information is provided in the available data.
Potential Impact
The vulnerability impacts the integrity of the SSH service by allowing forwarding capabilities that should have been disabled, potentially enabling unauthorized data forwarding or tunneling. There is no indication of confidentiality or availability impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisories for current remediation guidance. Until an official fix is released, administrators should review and possibly restrict the use of PermitTunnel and DisableForwarding settings to minimize risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-08T00:13:08.024Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4da0cec9d9e3dbe333a4aa
Added to database: 07/08/2026, 00:58:54 UTC
Last enriched: 07/15/2026, 12:19:46 UTC
Last updated: 08/21/2026, 22:52:13 UTC
Views: 205
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