The gen_class_pod implementation in lib/Config/Model/Utils/GenClassPod.pm in Config-Model (aka libconfig-model-perl) before 2.102 has a dangerous "use lib" line, which allows remote attackers to have an unspecified impact via a crafted Debian package file.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.