The ChangeWeDer/BaiduWenkuSpider_flaskWeb repository before 2021-11-29 on GitHub allows absolute path traversal because the Flask send_file function is used unsafely.
https://github.com/github/securitylab/issues/669#issuecomment-1117265726
https://github.com/ChangeWeDer/BaiduWenkuSpider_flaskWeb/pull/3