In UrBackup 2.2.6, an attacker can send a malformed request to the client over the network, and trigger a fileservplugin/CClientThread.cpp CClientThread::GetFileHashAndMetadata NULL pointer dereference, leading to shutting down the client application.
https://github.com/MostafaSoliman/Security-Advisories/blob/master/CVE-2018-20014