# Prototype Pollution in lodash

Advisory record · `GHSA-4xc9-xhrj-v574`

- **Identifiers:** `GHSA-4xc9-xhrj-v574` · `CVE-2018-16487`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **Weakness (CWE):** [CWE-400](https://cwe.mitre.org/data/definitions/400.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 7 Feb 2019
- **Updated:** 12 Aug 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 7 Feb 2019, 18:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `lodash` (npm): affected `<4.17.11`; fixed in `4.17.11`
- `lodash-rails` (RubyGems): affected `<4.17.11`; fixed in `4.17.11`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.015, the 74th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 7 Feb 2019. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-4xc9-xhrj-v574](https://github.com/advisories/GHSA-4xc9-xhrj-v574)
- [OSV: GHSA-4xc9-xhrj-v574](https://osv.dev/vulnerability/GHSA-4xc9-xhrj-v574)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-16487>
- <https://github.com/lodash/lodash/commit/90e6199a161b6445b01454517b40ef65ebecd2ad>
- <https://hackerone.com/reports/380873>
- <https://github.com/rubysec/ruby-advisory-db/blob/master/gems/lodash-rails/CVE-2018-16487.yml>
- <https://security.netapp.com/advisory/ntap-20190919-0004>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-4xc9-xhrj-v574>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-4xc9-xhrj-v574/>. Everything for agents: <https://agentprime.io/llms.txt>.