In TigerVNC (VNCSConnectionST.cxx VNCSConnectionST::fence), an authenticated client can cause a double free, leading to a crash of the TigerVNC server.
Created tigervnc tracking bugs for this issue:
Affects: fedora-all [bug 1438704]
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2017:2000 https://access.redhat.com/errata/RHSA-2017:2000