High 8.8Published Jul 15, 2026

CVE-2026-623129Router: Authenticated RCE via Unvalidated MCP Plugin Arguments

Updated under an hour ago (Oct 27, 2026, 2:00 AM ET)

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It affects decolua 9router. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for decolua 9router

Exploited in the last 30 days

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: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

decolua 9router decolua:9router (from the name)	before 0.5.2	CNA record

References

References

https://github.com/decolua/9router/security/advisories/GHSA-63p9-g54h-prrp	x-refsource-confirm
https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc	x-refsource-misc
https://github.com/decolua/9router/releases/tag/v0.5.2	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.