CVE-2018-3722: Merge-Deep Project Merge-Deep

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

merge-deep node module before 3.0.1 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability, which allows a malicious user to modify the prototype of "Object" via __proto__, causing the addition or modification of an existing property that will exist on all objects.

Affected products

• Merge-Deep Project Merge-Deep: before 3.0.1 (fixed in 3.0.1)

Published 2018-06-07. Last modified 2026-06-17.