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Libxml versions prior to 2.13 cannot correctly handle a call to xmlNodeSetName() with a name longer than 2G. It will leave the node object in an invalid state with a NULL name. This later causes a NULL pointer dereference when using the name during message serialization. To solve this, implement a workaround that resets the name to the sentinel name if this situation arises. Versions of libxml of 2.13 and higher are not affected. This can be exploited if a SoapVar is created with a fully qualified name that is longer than 2G. This would be possible if some application code uses a namespace prefix from an untrusted source like from a remote SOAP service. Co-authored-by: Niels Dossche <7771979+nielsdos@users.noreply.github.com>