CVE-2026-106586: CWE-670 Always-Incorrect Control Flow Implementation in OpenBSD OpenSSH
Description
CVE-2026-106586 is a low-severity vulnerability in OpenSSH versions before 10.6 where the 'restrict' keyword in authorized_keys did not apply to tunnel forwarding as intended. This represents an incorrect control flow implementation issue distinct from CVE-2026-73283.
CVSS v3.1
Score 2.5low
Affected software
OpenBSD
OpenSSH
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in OpenSSH prior to version 10.6 involves the 'restrict' keyword in authorized_keys, which was supposed to restrict tunnel forwarding but failed to do so. The flaw is categorized under CWE-670 (Always-Incorrect Control Flow Implementation). It does not affect confidentiality or availability but can lead to limited integrity impact. The CVSS 3.1 base score is 2.5, reflecting low severity with local attack vector, high attack complexity, low privileges required, no user interaction, and unchanged scope.
Potential Impact
The vulnerability allows an attacker with local access and low privileges to bypass restrictions on tunnel forwarding specified by the 'restrict' keyword in authorized_keys. There is no impact on confidentiality or availability, but integrity may be affected to a limited extent. No known exploits are reported in the wild.
Mitigation Recommendations
A fix is available in OpenSSH version 10.6 and later. Users should upgrade to version 10.6 or newer to remediate this issue. Since no vendor advisory or patch link is provided, users should consult official OpenBSD/OpenSSH sources for the update. Until patched, avoid relying solely on the 'restrict' keyword to control tunnel forwarding.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-10-06T20:57:08.698Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ac562452cdf04f656de8cf5
Added to database: 10/06/2026, 21:04:05 UTC
Last enriched: 10/06/2026, 21:18:44 UTC
Last updated: 10/06/2026, 21:18:55 UTC
Views: 4
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