CVE-2026-46339: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in decolua 9router
9Router versions from 0.4.30 up to but not including 0.4.37 contain an OS command injection vulnerability in the src/proxy.js middleware. This flaw allows unauthenticated attackers to register custom plugins and execute commands via the MCP bridge due to insufficient protection of certain API endpoints. The vulnerability is fixed starting with version 0.4.37.
AI Analysis
Technical Summary
The vulnerability in 9Router (CVE-2026-46339) involves improper neutralization of special elements used in OS commands (CWE-78) and insufficient access control (CWE-306) in the src/proxy.js middleware. Specifically, the /api/cli-tools/* and /api/mcp/* endpoints did not enforce authentication, enabling unauthenticated registration of custom plugins through src/app/api/cli-tools/cowork-settings/route.js and subsequent command execution through the MCP bridge. This allows remote attackers to execute arbitrary OS commands. The issue affects versions >=0.4.30 and <0.4.37 and is resolved in version 0.4.37.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary operating system commands on the affected 9Router device, leading to complete compromise of confidentiality, integrity, and availability. The CVSS 3.1 base score is 10.0 (Critical), indicating maximum impact with network attack vector, no privileges required, no user interaction, and scope change.
Mitigation Recommendations
Upgrade 9Router to version 0.4.37 or later, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Until upgrade, restrict access to the affected API endpoints to trusted users or networks if possible.
CVE-2026-46339: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in decolua 9router
Description
9Router versions from 0.4.30 up to but not including 0.4.37 contain an OS command injection vulnerability in the src/proxy.js middleware. This flaw allows unauthenticated attackers to register custom plugins and execute commands via the MCP bridge due to insufficient protection of certain API endpoints. The vulnerability is fixed starting with version 0.4.37.
CVSS v3.1
Score 10.0critical
Affected software
pkg:github/decolua/9routerRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in 9Router (CVE-2026-46339) involves improper neutralization of special elements used in OS commands (CWE-78) and insufficient access control (CWE-306) in the src/proxy.js middleware. Specifically, the /api/cli-tools/* and /api/mcp/* endpoints did not enforce authentication, enabling unauthenticated registration of custom plugins through src/app/api/cli-tools/cowork-settings/route.js and subsequent command execution through the MCP bridge. This allows remote attackers to execute arbitrary OS commands. The issue affects versions >=0.4.30 and <0.4.37 and is resolved in version 0.4.37.
Potential Impact
Successful exploitation allows unauthenticated remote attackers to execute arbitrary operating system commands on the affected 9Router device, leading to complete compromise of confidentiality, integrity, and availability. The CVSS 3.1 base score is 10.0 (Critical), indicating maximum impact with network attack vector, no privileges required, no user interaction, and scope change.
Mitigation Recommendations
Upgrade 9Router to version 0.4.37 or later, where this vulnerability is fixed. No other official remediation or temporary fixes are documented. Until upgrade, restrict access to the affected API endpoints to trusted users or networks if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-13T18:37:30.990Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57f59668715ace437838c4
Added to database: 07/15/2026, 21:03:18 UTC
Last enriched: 07/22/2026, 23:02:50 UTC
Last updated: 08/23/2026, 10:52:09 UTC
Views: 105
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