Fault of kdelibs. Ideally we’ll get rid of but we may or may not. Root cause is kdesudo vs gksudo. Not a security issue, just a usability issue. Discussion here:
Technical:
dpkg -S /usr/share/applications/kde4/ktelnetservice.desktop
kdelibs5-data: /usr/share/applications/kde4/ktelnetservice.desktop
dpkg -S /usr/bin/ktelnetservice
kdelibs-bin: /usr/bin/ktelnetservice
dpkg -S /usr/share/applications/kde4/kmailservice.desktop
kdelibs5-data: /usr/share/applications/kde4/kmailservice.desktop
Exec=kmailservice %u
dpkg -S `which kmailservice`
kdelibs-bin: /usr/bin/kmailservice