# CVE-2026-7400: geekgod382 filesystem-mcp-server read_file_tool/write_file_tool server.py is_path_allowed path traversal

> A path traversal vulnerability in the filesystem MCP server allows remote attackers to read or modify arbitrary files outside the intended directory.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Apr 2026
- **Updated:** 29 Apr 2026
- **Also known as:** GHSA-wgg9-6667-c9w2

## What is CVE-2026-7400?

CVE-2026-7400 is a medium-severity path traversal vulnerability in geekgod382 filesystem-mcp-server, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A security vulnerability has been detected in geekgod382 filesystem-mcp-server 1.0.0. This issue affects the function is_path_allowed of the file server.py of the component read_file_tool/write_file_tool. Such manipulation leads to path traversal. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 1.1.0 is capable of addressing this issue. The name of the patch is 45364545fc60dc80aadcd4379f08042d3d3d292e. Upgrading the affected component is advised.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-7400?


## How do I fix CVE-2026-7400?

No fix has been published for CVE-2026-7400 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7400 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7400 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7400 and fix it if it is affected.

What it is: CVE-2026-7400 is a medium-severity path traversal vulnerability in geekgod382 filesystem-mcp-server, published on 29 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7400 exists.

Affected product: geekgod382 filesystem-mcp-server. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-7400/ (Markdown: https://insights.sbomify.com/CVE-2026-7400/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7400
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7400
- OSV: https://osv.dev/vulnerability/CVE-2026-7400

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7400/
Summaries are generated and may contain mistakes; the official description above is the record.