# Prototype Pollution in hoek

Advisory record · `GHSA-jp4x-w63m-7wgm`

- **Identifiers:** `GHSA-jp4x-w63m-7wgm` · `CVE-2018-3728`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-471](https://cwe.mitre.org/data/definitions/471.html) · [CWE-1321](https://cwe.mitre.org/data/definitions/1321.html)
- **Tags:** [Prototype pollution](https://agentprime.io/advisories/tag/prototype-pollution.md) · [CWE-471](https://agentprime.io/advisories/tag/cwe-471.md)
- **Published:** 26 Apr 2018
- **Updated:** 29 May 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 26 Apr 2018, 15:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `hoek` (npm): affected `>=5.0.0, <5.0.3 || <4.2.1`; fixed in `5.0.3`, `4.2.1`

## 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

- 8.8 High, CVSS 3.0: `CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.042, the 90th percentile, on 5 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 26 Apr 2018. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-jp4x-w63m-7wgm](https://github.com/advisories/GHSA-jp4x-w63m-7wgm)
- [OSV: GHSA-jp4x-w63m-7wgm](https://osv.dev/vulnerability/GHSA-jp4x-w63m-7wgm)
- <https://nvd.nist.gov/vuln/detail/CVE-2018-3728>
- <https://github.com/hapijs/hoek/commit/32ed5c9413321fbc37da5ca81a7cbab693786dee>
- <https://github.com/hapijs/hoek/commit/5aed1a8c4a3d55722d1c799f2368857bf418d6df>
- <https://hackerone.com/reports/310439>
- <https://access.redhat.com/errata/RHSA-2018:1263>
- <https://access.redhat.com/errata/RHSA-2018:1264>
- <https://github.com/hapijs/hoek>
- <https://snyk.io/vuln/npm:hoek:20180212>
- <https://web.archive.org/web/20200227131737/https://www.securityfocus.com/bid/103108>

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-jp4x-w63m-7wgm>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-jp4x-w63m-7wgm/>. Everything for agents: <https://agentprime.io/llms.txt>.