The utilities function in all versions <= 1.0.0 of the merge-options node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function.
CVSS 3.0CRITICAL 9.8·Network·No auth·No interaction·EPSS 0.01428·Published 2018-07-03·Fixed in 1.0.1CWE-20