few envoronment vaqriables used by bash perl and python are not cleaned.
vulners.com/securityvulns/securityvulns:doc:10036
vulners.com/securityvulns/securityvulns:doc:10204
vulners.com/securityvulns/securityvulns:doc:10933
vulners.com/securityvulns/securityvulns:doc:7190