Vite is a modern frontend build tool. In Vite prior to versions 6.4.3, 6.3.4, and 5.4.23, a directory traversal vulnerability affects the Vite development server. When the Vite dev server is launched with the --host or server.host option, an unauthenticated attacker can craft a request with a path containing dot segments (e.g., /.vite/../<filename>) to bypass static file restrictions and access arbitrary files on the filesystem under the project root. The vulnerability allows access to files normally denied by Vite’s "server.fs.deny" setting, including sensitive files like .env, configuration files, or credentials in the project root. This issue has been fixed in versions 6.4.3, 6.3.4, and 5.4.23.
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