CVE-2025-67366
SylphXLtd Filesystem-MCP Symlink Path Traversal Vulnerability
Description
@sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality. Version 0.5.8 of filesystem-mcp contains a critical path traversal vulnerability in its "read_content" tool. This vulnerability arises from improper symlink handling in the path validation mechanism: the resolvePath function checks path validity before resolving symlinks, while fs.readFile resolves symlinks automatically during file access. This allows attackers to bypass directory restrictions by leveraging symlinks within the allowed directory that point to external files, enabling unauthorized access to files outside the intended operational scope.
INFO
Published Date :
Jan. 7, 2026, 5:16 p.m.
Last Modified :
Jan. 29, 2026, 1:02 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the filesystem-mcp package to a secure version.
- Ensure path validation happens after symlink resolution.
- Sanitize all user-supplied file paths.
- Implement strict access controls.
Public PoC/Exploit Available at Github
CVE-2025-67366 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-67366.
| URL | Resource |
|---|---|
| https://github.com/sylphxltd/filesystem-mcp | Product |
| https://github.com/sylphxltd/filesystem-mcp/issues/134 | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-67366 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-67366
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Rust Python
Framework to enumerate and exploit MCP servers
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-67366 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-67366 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 29, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:sylphx:filesystem-mcp:0.5.8:*:*:*:*:node.js:*:* Added Reference Type MITRE: https://github.com/sylphxltd/filesystem-mcp Types: Product Added Reference Type MITRE: https://github.com/sylphxltd/filesystem-mcp/issues/134 Types: Exploit, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jan. 07, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-23 -
New CVE Received by [email protected]
Jan. 07, 2026
Action Type Old Value New Value Added Description @sylphxltd/filesystem-mcp v0.5.8 is an MCP server that provides file content reading functionality. Version 0.5.8 of filesystem-mcp contains a critical path traversal vulnerability in its "read_content" tool. This vulnerability arises from improper symlink handling in the path validation mechanism: the resolvePath function checks path validity before resolving symlinks, while fs.readFile resolves symlinks automatically during file access. This allows attackers to bypass directory restrictions by leveraging symlinks within the allowed directory that point to external files, enabling unauthorized access to files outside the intended operational scope. Added Reference https://github.com/sylphxltd/filesystem-mcp Added Reference https://github.com/sylphxltd/filesystem-mcp/issues/134