CVE-2026-73283: CWE-670 Always-Incorrect Control Flow Implementation in OpenBSD OpenSSH
In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.
AI Analysis
Technical Summary
CVE-2026-73283 is a control flow implementation flaw (CWE-670) in OpenSSH versions prior to 10.5. The 'restrict' keyword in the authorized_keys file, which is intended to restrict tunnel forwarding, does not function correctly, allowing tunnel forwarding despite restrictions. This issue affects the sshd component of OpenSSH and represents a logic error in enforcing access controls.
Potential Impact
The vulnerability allows users with authorized keys that specify the 'restrict' keyword to bypass intended restrictions on tunnel forwarding. The CVSS score of 2.5 (low severity) indicates limited impact, with no confidentiality or availability impact, and only low integrity impact. Exploitation requires local access with low privileges and high attack complexity.
Mitigation Recommendations
No official patch or remediation level has been provided yet. Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisory for current remediation guidance. Until a fix is available, administrators should be aware that the 'restrict' keyword does not properly restrict tunnel forwarding and consider alternative access control measures or monitoring.
CVE-2026-73283: CWE-670 Always-Incorrect Control Flow Implementation in OpenBSD OpenSSH
Description
In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tunnel forwarding but was not.
CVSS v3.1
Score 2.5low
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-73283 is a control flow implementation flaw (CWE-670) in OpenSSH versions prior to 10.5. The 'restrict' keyword in the authorized_keys file, which is intended to restrict tunnel forwarding, does not function correctly, allowing tunnel forwarding despite restrictions. This issue affects the sshd component of OpenSSH and represents a logic error in enforcing access controls.
Potential Impact
The vulnerability allows users with authorized keys that specify the 'restrict' keyword to bypass intended restrictions on tunnel forwarding. The CVSS score of 2.5 (low severity) indicates limited impact, with no confidentiality or availability impact, and only low integrity impact. Exploitation requires local access with low privileges and high attack complexity.
Mitigation Recommendations
No official patch or remediation level has been provided yet. Patch status is not yet confirmed — check the OpenBSD or OpenSSH vendor advisory for current remediation guidance. Until a fix is available, administrators should be aware that the 'restrict' keyword does not properly restrict tunnel forwarding and consider alternative access control measures or monitoring.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-08-11T19:15:24.007Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7b77a2bf8831d5394b40d3
Added to database: 08/11/2026, 19:27:30 UTC
Last enriched: 08/11/2026, 19:42:25 UTC
Last updated: 08/11/2026, 20:26:54 UTC
Views: 4
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