CVE-2025-67364: Fast filesystem mcp Path Traversal Vulnerability

HIGH
Advisory Identifier: GHSA-j893-m93w-jwjw
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CVSS 7.5
CWE-24
Published
Advisory Summary

CVE-2025-67364 is a HIGH (CVSS 7.5) path traversal vulnerability (CWE-24: Path Traversal: '../filedir') affecting Fast filesystem mcp libraries in the npm ecosystem. The issue involves fast-filesystem-mcp has a path traversal vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2025-67364 at a Glance

CVE Identifier CVE-2025-67364
GHSA Identifier GHSA-j893-m93w-jwjw
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-24: Path Traversal: '../filedir'
Affected Product Fast filesystem mcp
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2025-67364

To remediate this vulnerability, upgrade all affected Fast filesystem mcp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

fast-filesystem-mcp fixed: Latest secure release 
npm install fast-filesystem-mcp@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls fast-filesystem-mcp

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-67364, inspect your project dependencies using npm:

npm ls fast-filesystem-mcp

Analyze the terminal output to locate any version of Fast filesystem mcp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls fast-filesystem-mcp command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-24: Path Traversal: '../filedir', where the product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory. In Fast filesystem mcp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools including fast_read_file. This vulnerability arises from improper path validation that fails to resolve symbolic links to their actual physical paths. The safePath and isPathAllowed functions use path.resolve() which does not handle symlinks, allowing attackers to bypass directory access restrictions by creating symlinks within allowed directories that point to restricted system paths. When these symlinks are accessed through valid path references, the validation checks are circumvented, enabling access to unauthorized files.

CVE-2025-67364 Affected Fast filesystem mcp Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
fast-filesystem-mcp
npm/fast-filesystem-mcp
npm
≤ 3.4.0

References

NVD — CVE-2025-67364 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-67364
Fast filesystem mcp Source Repository REPOSITORY
https://github.com/efforthye/fast-filesystem-mcp/issues/10
Fast filesystem mcp Source Repository REPOSITORY
https://github.com/efforthye/fast-filesystem-mcp

Frequently Asked Questions

What is CVE-2025-67364?
CVE-2025-67364 is a security vulnerability in Fast filesystem mcp involving fast-filesystem-mcp has a Path Traversal vulnerability under CWE-24: Path Traversal: '../filedir'.
Which Fast filesystem mcp versions are affected?
Affected versions include releases prior to current release patches across affected packages: fast-filesystem-mcp.
What version fixes CVE-2025-67364?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is fast-filesystem-mcp affected?
Yes, fast-filesystem-mcp is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2025-67364?
CVE-2025-67364 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2025-67364?
CVE-2025-67364 is classified under CWE-24: Path Traversal: '../filedir' (The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize "../" sequences that can resolve to a location that is outside of that directory.).
How can I check npm dependencies for CVE-2025-67364?
Run the dependency tree command: 'npm ls fast-filesystem-mcp'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-j893-m93w-jwjw",
  "modified" : "2026-01-08T17:18:26Z",
  "published" : "2026-01-07T18:30:26Z",
  "aliases" : [ "CVE-2025-67364" ],
  "summary" : "fast-filesystem-mcp has a Path Traversal vulnerability",
  "details" : "fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools including fast_read_file. This vulnerability arises from improper path validation that fails to resolve symbolic links to their actual physical paths. The safePath and isPathAllowed functions use path.resolve() which does not handle symlinks, allowing attackers to bypass directory access restrictions by creating symlinks within allowed directories that point to restricted system paths. When these symlinks are accessed through valid path references, the validation checks are circumvented, enabling access to unauthorized files.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fast-filesystem-mcp"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.4.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-67364"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/efforthye/fast-filesystem-mcp/issues/10"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/efforthye/fast-filesystem-mcp"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-24" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-01-08T17:18:26Z",
    "nvd_published_at" : "2026-01-07T17:16:01Z"
  }
}