robinweser fast-loops could allow a remote attacker to execute arbitrary code on the system, caused by a prototype pollution in the function objectMergeDeep. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary code or cause a denial of service.

Overview

The npm package y18n before versions 3.2.2, 4.0.1, and 5.0.5 is vulnerable to Prototype Pollution.

POC

js const y18n = require('y18n')();

y18n.setLocale('proto'); y18n.updateLocale({polluted: true});

console.log(polluted); // true

Recommendation

Upgrade to version 3.2.2, 4.0.1, 5.0.5 or later.

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