GHSA-376H-93R7-7G6F Astro: Authorization bypass from missing path-segment boundary check when stripping the configured base

Summary Astro stripped a configured base path from request pathnames using a string-prefix check that did not verify a path-segment boundary. With base: "/app", a request to /appX/admin was treated as being under the base and resolved internally to the /admin route, while middleware still observe...