CVE-2020-7598: Input Validation

Affected versions of minimist are vulnerable to prototype pollution. Arguments are not properly sanitized, allowing an attacker to modify the prototype of Object, causing the addition or modification of an existing property that will exist on all objects. Parsing the argument --proto.y=Polluted adds a y property with value Polluted to all objects. The argument --proto=Polluted raises and uncaught error and crashes the application. This is exploitable if attackers have control over the arguments being passed to minimist.

Recommendation

Upgrade to versions 0.2.1, 1.2.3 or later.

— GitHub

minimist before 1.2.2 could be tricked into adding or modifying properties of Object.prototype using a "constructor" or "proto" payload.

minimist could provide weaker than expected security, caused by a prototype pollution flaw. By sending a specially crafted request, a remote attacker could exploit this vulnerability to add or modify properties of Object.prototype.

— IBM