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CVE-2018-16487: Prototype Pollution in lodash

February 7, 2019 (updated August 12, 2025)

Versions of lodash before 4.17.11 are vulnerable to prototype pollution.

The vulnerable functions are ‘defaultsDeep’, ‘merge’, and ‘mergeWith’ which allow a malicious user to modify the prototype of Object via {constructor: {prototype: {...}}} causing the addition or modification of an existing property that will exist on all objects.

References

  • github.com/advisories/GHSA-4xc9-xhrj-v574
  • github.com/lodash/lodash/commit/90e6199a161b6445b01454517b40ef65ebecd2ad
  • github.com/rubysec/ruby-advisory-db/blob/master/gems/lodash-rails/CVE-2018-16487.yml
  • hackerone.com/reports/380873
  • nvd.nist.gov/vuln/detail/CVE-2018-16487
  • security.netapp.com/advisory/ntap-20190919-0004

Code Behaviors & Features

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Affected versions

All versions before 4.17.11

Fixed versions

  • 4.17.11

Solution

Upgrade to version 4.17.11 or above.

Impact 5.6 MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Learn more about CVSS

Weakness

  • CWE-400: Uncontrolled Resource Consumption

Source file

gem/lodash-rails/CVE-2018-16487.yml

Spotted a mistake? Edit the file on GitLab.

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