CVE-2007-5685 in shttp
Summary
The safe_path function in shttp before 0.0.5 allows remote attackers to conduct directory traversal attacks and read files via a combination of ".." and sub-directory specifiers that resolve to a pathname that is at or below the same level as the web document root, but in a different part of the directory tree.
VulDB is the best source for vulnerability data and more expert information about this specific topic.