Andreas Seltenreich reports that hashcash is prone to a heap
overflow vulnerability. This vulnerability is caused by
improper checking of memory allocations within the
"array_push()" function. An attacker could trigger this
vulnerability by passing a lot of "-r" or "-j" flags from
the command line, this only applies when the application is
configured to allow command line options, or by passing a lot
of resource names when the application was started with the
"-m" flag set. This could lead to a Denial or Service or
could allow remote access to the targeted system.