All versions of defaults-deep are vulnerable to prototype pollution. Provided certain input defaults-deep can add or modify properties of the Object prototype. These properties will be present on all objects.

Recommendation

As no patch is currently available for this vulnerability it is our recommendation to select another module that can provide this functionality.

References

• https://nvd.nist.gov/vuln/detail/CVE-2018-16486
• https://hackerone.com/reports/380878
• GHSA-pjxw-22xf-6pwc
• https://www.npmjs.com/advisories/778