GHSA-wmfp-5q7x-987x

### Impact The `layout`, `render`, and `include` tags allow arbitrary file access via absolute paths (either as string literals or through Liquid variables, the latter require `dynamicPartials: true`, which is the default). This poses a security risk when malicious users are allowed to control the template content or specify the filepath to be included as a Liquid variable.

### Patches The root cause is LiquidJS allows `require.resolve()` as fallback but doesn't limit the directories it can resolve to. The issue is fixed via [#855](https://github.com/harttle/liquidjs/pull/855) and published version 10.25.0 on npm.

### Workarounds #### Change the files in build time In build time, through Shell script or Webpack `string-replace-loader`, change the file content of correxponding file (depending on your package `type`, for CommonJS it's `dist/liquid.node.js`) under `dist/`,

```diff if (fs.fallback !== undefined) { const filepath = fs.fallback(file) - if (filepath !== undefined) yield filepath + if (filepath !== undefined) { + for (const dir of dirs) { + if (!enforceRoot || this.contains(dir, filepath)) { + yield filepath + break + } + } } } ```

#### Overriding by `fs` LiquidJS option Adding a [`fs` option](https://liquidjs.com/api/interfaces/FS.html) to override the [default `fs` implementation](https://github.com/harttle/liquidjs/blob/1b85fdaa9c535021f7030a239a64003af26d31b5/src/fs/fs-impl.ts#L36-L40):

```javascript const { statSync, readFileSync, promises: { stat, readFile } } = require('fs') const { resolve, extname, dirname, sep } = require('path')

const fs = { exists: async (fp) => { try { await stat(fp); return true; } catch { return false } }, existsSync: (fp) => { try { statSync(fp); return true } catch { return false } }, resolve: (root, file, ext) => resolve(root, file + (extname(file) ? '' : ext)), contains: (root, file) => { const r = resolve(root) return file.startsWith(r.endsWith(sep) ? r : r + sep) }, readFile: (fp) => readFile(fp, 'utf8'), readFileSync: (fp) => readFileSync(fp, 'utf8'), fallback: () => undefined, dirname, sep };

const engine = new Liquid({ fs }) ```

### References Discussions: https://github.com/harttle/liquidjs/pull/851 Code fix: https://github.com/harttle/liquidjs/pull/855