Python Information Disclosure in PyDoc (CVE-2021-3426)

Python’s versions prior to 3.6.13, 3.7.10, 3.8.9, 3.9.3 and 3.10.0a7 is affected by information disclosure vulnerability due to pydoc -p: /getfile?key=path that allows user to read arbitrary file on the filesystem. An unauthenticated, local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality.