to the regular expression looking for wildcard symbols to determine the pathPrefix in line 542 of network/ssl/qsslcertificate.cpp
This was probably intended to be [^\\\\] as this currently breaks the regular expression by escaping the ].
So a match is made at the first position causing pos in that function to be 0 and always doing the lookup
in the working directory and not in path. This can be extremly nasty as a dirIterator is created on that pathprefix walking over all file names. Depending on your starting directory this can cause the iterator to walk over your complete disk and i experienced extreme delays on Windows.