Arbitrary file deletion

In postgresql 9.3.x before 9.3.21, 9.4.x before 9.4.16, 9.5.x before 9.5.11, 9.6.x before 9.6.7 and 10.x before 10.2, pgupgrade creates file in current working directory containing the output of pgdumpall -g under umask which was in effect when the user invoked pgupgrade, and not under 0077 which...