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.
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