GitPython: Denial of Service via catastrophic backtracking (ReDoS) in Actor.name_email_regex — commit author/committer field parsing

Summary GitPython's Actor.nameemailregex regular expression git/util.py, line 863 is vulnerable to catastrophic backtracking ReDoS — Regular Expression Denial of Service. When GitPython parses the author or committer header of a git commit object that contains a long string with an unterminated ,...