In Qt 5.9.x through 5.15.x before 5.15.9 and 6.x before 6.2.4 on Linux and UNIX, QProcess could execute a binary from the current working directory when not found in the PATH.
https://download.qt.io/official_releases/qt/6.2/qprocess6-2.diff
https://download.qt.io/official_releases/qt/5.15/qprocess5-15.diff
https://codereview.qt-project.org/c/qt/qtbase/+/396020