The set_version script as shipped with obs-service-set_version is a source validator for the Open Build Service (OBS). In versions prior to 0.5.3-1.1 this script did not properly sanitize the input provided by the user, allowing for code execution on the executing server.
In the web ui of the openbuildservice before 2.3.0 a code injection of the project rebuildtimes statistics could be used by authorized attackers to execute shellcode.