Vulnerability record · CVE-2026-18482 · published 20 August 2026

CVE-2026-18482: OS command injection vulnerability

Neo.mjs contains a command injection vulnerability within the FileSystemService.mjs component of the ai/mcp/server/file-system MCP server, where the checkSyntax() and runPlaywrightTest() functions unsafely interpolate caller-controlled absolutePath values into shell commands, enabling arbitrary OS command execution when an AI agent is induced to invoke these tools. Commit 88c77fc fixes these vulnerabilities.

9.8 CVSS 3.1 Critical EPSS 1.7% · top 24.4% CWE-78 · OS command injection Awaiting Analysis

9.8CVSS 3.1 base score

1.7%EPSS exploitation probability, 30 days

NoNot in CISA KEV

0Affected product versions listed by NVD

4References

3 Sep 2026Last modified by NVD

Description

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

References

Link	Tags
https://github.com/neomjs/neo/commit/5acc564ea1b278bca5fab1f8f397a6ba9b849d75
https://github.com/neomjs/neo/commit/88c77fc4
https://novice-22.com/posts/neo-mjs/
https://novice-22.com/posts/neo-mjs/

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Source: NIST National Vulnerability Database (record CVE-2026-18482), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.