better-helperjs Vulnerable to Directory Traversal via String Prefix Bypass in Static Server
## Summary A directory traversal vulnerability exists in the production static file server of `better-helperjs` (`<= 3.0.5`). Attackers can read arbitrary files located in adjacent directory structures that share the same string prefix as the intended static root directory. ## Details The framework utilizes a custom static file server engine used when running in `NODE_ENV=production` (`src/ssr/site-server.ts`). Inside the `safeStaticPath()` method, the requested path is checked against the static root directory to prevent directory traversal out of the designated public folder. However, the validation uses `String.prototype.startsWith()`: `
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