YARD is a documentation generation tool for the Ruby programming language. Prior to version 0.9.44, YARD's static cache lookup reads a request path before the router's path cleanup runs. When a server is configured with a document root, a traversal path such as "/../yard-cache-secret.html" is joined against that root and can return a readable sibling ".html" file outside the intended static tree. Version 0.9.44 patches the issue.