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High, CVSS 7.5amended

fast-filesystem-mcp has a Path Traversal vulnerability

CVE-2025-67364GHSA-j893-m93w-jwjw

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm fast-filesystem-mcp

    Affected
    <= 3.4.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS
  • CVE-2025-67364: 0.63% estimated exploitation activity in the next 30 days; percentile 50.43 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

fast-filesystem-mcp version 3.4.0 contains a critical path traversal vulnerability in its file operation tools including fastreadfile. 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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-j893-m93w-jwjw

  2. Revision 1 · created ·

    Published from osv record GHSA-j893-m93w-jwjw

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-67364

Advisory: fast-filesystem-mcp has a Path Traversal vulnerability
IDs: CVE-2025-67364, GHSA-j893-m93w-jwjw
Record: https://patchnext.com/advisories/cve-2025-67364 (revision 2, source checked 26 Oct 2026, 12:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm fast-filesystem-mcp: affected <= 3.4.0

## Suggested inspection (read-only)
- `npm ls fast-filesystem-mcp --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on fast-filesystem-mcp.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-j893-m93w-jwjw (OSV record GHSA-j893-m93w-jwjw lists affected ranges: npm fast-filesystem-mcp >=0 <=3.4.0)
- Verified: https://github.com/advisories/GHSA-j893-m93w-jwjw (GitHub-reviewed advisory GHSA-j893-m93w-jwjw lists affected ranges: npm fast-filesystem-mcp >=0 <=3.4.0)

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