Nowadays, developers are often using multiple programming languages to exploit the advantages of each language and to reuse code. However, dependency analysis across multilanguage is more challenging compared to mono-language systems. In this article, we introduce two approaches for multilanguage dependency analysis: static multilanguage dependency analyzer) and historical multilanguage dependency analyzer, which we apply on ten open-source multilanguage systems to empirically analyze the prevalence of the dependencies across languages, i.e., interlanguage dependencies and their impact on software quality and security. Our main results show that: the more interlanguage dependencies, the higher the risk of bugs and vulnerabilities being introduced, while this risk remains constant for intralanguage dependencies; the percentage of bugs within interlanguage dependencies is three times higher than the percentage of bugs identified in intralanguage dependencies; the percentage of vulnerabilities within interlanguage dependencies is twice the percentage of vulnerabilities introduced in intralanguage dependencies.