The package y18n before 3.2.2, 4.0.1 and 5.0.5, is vulnerable to Prototype Pollution. A flaw was found in nodejs-y18n. There is a prototype pollution vulnerability in y18n's locale functionality. If an attacker is able to provide untrusted input via locale, they may be able to cause denial of service or in rare circumstances, impact to data integrity or confidentiality.
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