merge-deep up to 3.0.0 on Node.js Object access control

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in merge-deep up to 3.0.0 on Node.js (JavaScript Library). It has been rated as critical. Affected by this issue is an unknown functionality. The manipulation as part of a Object leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The bug was discovered 04/25/2018. The weakness was shared 06/07/2018 (Website). The advisory is shared for download at This vulnerability is handled as CVE-2018-3722 since 12/28/2017. The exploitation is known to be easy. The attack may be launched remotely. The successful exploitation needs a simple authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 3.0.1 eliminates this vulnerability.






CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍


Class: Access control
CWE: CWE-284 / CWE-266
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: merge-deep 3.0.1


12/28/2017 🔍
04/25/2018 +118 days 🔍
06/06/2018 +41 days 🔍
06/07/2018 +1 days 🔍
06/07/2018 +0 days 🔍
03/21/2023 +1748 days 🔍


Advisory: 2c33634da7129a5aefcc262d2fec2e72224404e5
Status: Not defined

CVE: CVE-2018-3722 (🔍)


Created: 06/07/2018 10:47 AM
Updated: 03/21/2023 10:11 PM
Changes: 06/07/2018 10:47 AM (60), 02/16/2020 07:52 PM (1), 03/21/2023 10:11 PM (5)
Complete: 🔍


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