The create_response function in server/server.c in Psensor before 1.1.4 allows Directory Traversal because it lacks a check for whether a file is under the webserver directory.
git.wpitchoune.net/gitweb/?p=psensor.git%3Ba=blob%3Bf=NEWS
git.wpitchoune.net/gitweb/?p=psensor.git%3Ba=commit%3Bh=48739caa745f9f8002e87af574f03e5dc6ae3447
git.wpitchoune.net/gitweb/?p=psensor.git%3Ba=commit%3Bh=8b10426dcc0246c1712a99460dd470dcb1cc4d9c
lists.debian.org/debian-lts-announce/2018/04/msg00026.html