GHSA-P538-C434-8V24 GitPython: Arbitrary file truncation via git rev-list --output argument injection in unguarded Commit.count

Summary Commit.count forwards kwargs into revlist with no checkunsafeoptions guard the guard exists only in the sibling iteritems, commit.py:341. git rev-list --output= opens and truncates the target file to 0 bytes before revision parsing, so countoutput='/victim' destroys/blanks an arbitrary...