Vulnerability Description
9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279
- https://github.com/decolua/9router/releases/tag/v0.5.2
- https://github.com/decolua/9router/security/advisories/GHSA-63p9-g54h-prrp
- https://github.com/decolua/9router/security/advisories/GHSA-63p9-g54h-prrp
FAQ
What is CVE-2026-62312?
CVE-2026-62312 is a vulnerability with a CVSS score of 8.8 (HIGH). 9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass...
How severe is CVE-2026-62312?
CVE-2026-62312 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62312?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.