Remote Code Execution Vulnerability in 9router by Decolua
CVE-2026-63732

9.4CRITICAL

Key Information:

Vendor

Decolua

Status
9router
Vendor
CVE Published:
23 July 2026

What is CVE-2026-63732?

The 9router version 0.4.59 contains several interlinked vulnerabilities that allow an attacker to exploit the system. This includes a hardcoded default password allowing any new installation to be accessed. An attacker can spoof the Host header to bypass LOCAL_ONLY network restrictions and can exploit unvalidated arguments passed to the child_process.spawn() method during MCP plugin registration. This chain could enable the execution of arbitrary code on the operating system when the malicious MCP plugin is triggered.

Affected Version(s)

9router 0 < 0.4.60

9router 0.4.60

References

https://github.com/decolua/9router/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/9router-before-remot...
third-party-advisory

CVSS V4

Score:
9.4
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

darealDanh
.