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mark3labs mcp-filesystem-server v0.11.1 is vulnerable to Directory Traversal due to an improper link resolution in validatePath (filesystemserver/handler/helper.go). When filepath.EvalSymlinks returns os.IsNotExist for a dangling symlink, the fallback validates only the parent directory and returns the unresolved path, so writefile (and modifyfile, copyfile, movefile, createdirectory) follows a pre-existing dangling symlink located inside an allowed directory and creates a file outside the configured allowed directories.