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.

Recommendation

Update to version 4.17.11 or later.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-16487
• https://hackerone.com/reports/380873
• lodash/lodash@90e6199
• https://security.netapp.com/advisory/ntap-20190919-0004
• https://github.com/rubysec/ruby-advisory-db/blob/master/gems/lodash-rails/CVE-2018-16487.yml