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Vulnerability record · CVE-2018-3722 · published 7 June 2018

CVE-2018-3722: Merge-deep project merge-deep vulnerability

MMerge Deep Project · Merge Deep

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.

8.8 CVSS 3.0 High EPSS 2.0% · top 19.7% CWE-471 · CWE-471
8.8CVSS 3.0 base score, v2 6.5
2.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/jonschlinkert/merge-deep/commit/2c33634da7129a5aefcc262d2fec2e72224404e5 PatchThird Party Advisory
https://hackerone.com/reports/310708 ExploitThird Party Advisory
https://github.com/jonschlinkert/merge-deep/commit/2c33634da7129a5aefcc262d2fec2e72224404e5 PatchThird Party Advisory
https://hackerone.com/reports/310708 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2021-26707Merge-deep project merge-deep prototype pollution vulnerabilityThe merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These …EPSS 1.9%

Source: NIST National Vulnerability Database (record CVE-2018-3722), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.