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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

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS score

7.773%
(94th percentile)

Weaknesses

CVE ID

CVE-2020-7774

GHSA ID

GHSA-c4w7-xm78-47vh

Source code

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