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Vulnerability record · CVE-2026-62312 · published 15 July 2026

CVE-2026-62312: OS command injection vulnerability

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.

8.8 CVSS 3.1 High EPSS 1.3% · top 30.8% CWE-78 · OS command injection Deferred
8.8CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
16 Jul 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc
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

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Source: NIST National Vulnerability Database (record CVE-2026-62312), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.