CVE-2025-27098

Description

### Summary Missing check vulnerability in the static file handler allows any client to access the files in the server's file system ### Details When `staticFiles` is set in the `serve` settings in the configuration file, the following handler doesn't check if `absolutePath` is still under the directory provided as `staticFiles`; ```ts if (staticFiles) { router.get('/:relativePath+', async request => { let { relativePath } = request.params; if (!relativePath) { relativePath = 'index.html'; } const absolutePath = path.join(baseDir, staticFiles, relativePath); if (absolutePath.includes(staticFiles) && (await pathExists(absolutePath))) { const readStream = fs.createReadStream(absolutePath); return new Response(readStream as any, { status: 200, }); } return undefined; }); ``` ### Example scenario To reproduce it, set `staticFiles` to the relative path of a directory in `.meshrc.yml`; ```yml serve: staticFiles: ./public ``` Then start the server with `mesh dev`, and browse to `/..%2fpackage.json` then you will see the content of `package.json`. You can even go deeper to see sensitive data; `/..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2fetc/passwd` ### Impact and solution If `staticFiles` is set under `serve` in the configuration file. you have two options to fix vulnerability; - Update `@graphql-mesh/cli` to a version higher than `0.82.21`, and if you use `@graphql-mesh/http`, update it to a version higher than `0.3.18` - Remove `staticFiles` option from the configuration, and use other solutions to serve static files. ### Credits Thanks [[email protected]](mailto:[email protected]) for reporting this vulnerability with details

How to fix CVE-2025-27098

To remediate CVE-2025-27098, upgrade the affected package to a fixed version below.

• —upgrade to 0.82.22 or later
• —upgrade to 0.3.19 or later

Is CVE-2025-27098 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.