Genivia gSOAP 2.7.x and 2.8.x before 2.8.75 allows attackers to cause a denial of service (application abort) or possibly have unspecified other impact if a server application is built with the -DWITHCOOKIES flag. This affects the C/C++ libgsoapck/libgsoapck++ and libgsoapssl/libgsoapssl++ libraries, as these are built with that flag.

A buffer overflow can cause an open unsecured server to crash after 2GB (greater than 2147483711 bytes to trigger the software bug)) XML message is received. Fortunately, the overflowing data after 2GB is cleaned up in the buffer which means that the chances of exploiting this flaw (by injecting code) is significantly reduced in gSOAP versions affected.

References:

https://www.genivia.com/advisory.html