Remote Code Execution Vulnerability in 9Router by Decolua
CVE-2026-62312

8.8HIGH

Key Information:

Vendor

Decolua

Status
9router
Vendor
CVE Published:
15 July 2026

What is CVE-2026-62312?

9Router, an AI router and token saver developed by Decolua, contains a significant vulnerability that allows remote authenticated attackers to execute arbitrary code on the host operating system. This occurs due to a combination of a Host header bypass targeting localhost-only routes and unvalidated arguments from the MCP plugin passed to the child_process.spawn() function. Consequently, this flaw enables malicious custom plugins to execute arbitrary commands through the /api/mcp//sse endpoint. This issue has been addressed in version 0.5.2, which users are advised to upgrade to.

Affected Version(s)

9router < 0.5.2

References

https://github.com/decolua/9router/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/decolua/9router/commit/da667836cc7584b...
x_refsource_MISC
https://github.com/decolua/9router/releases/tag/v0.5.2
x_refsource_MISC

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.