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Vulnerability record · CVE-2018-3721 · published 7 June 2018

CVE-2018-3721: Lodash prototype pollution vulnerability

Lodash · Lodash

lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith functions, 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.

6.5 CVSS 3.1 Medium EPSS 2.4% · top 16.7% CWE-471 · CWE-471CWE-1321 · Prototype pollution
6.5CVSS 3.1 base score, v2 4.0
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

lodash node module before 4.17.5 suffers from a Modification of Assumed-Immutable Data (MAID) vulnerability via defaultsDeep, merge, and mergeWith functions, 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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected products

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

References

LinkTags
https://github.com/lodash/lodash/commit/d8e069cc3410082e44eb18fcf8e7f3d08ebe1d4a Patch
https://hackerone.com/reports/310443 ExploitThird Party Advisory
https://security.netapp.com/advisory/ntap-20190919-0004/ Third Party Advisory
https://github.com/lodash/lodash/commit/d8e069cc3410082e44eb18fcf8e7f3d08ebe1d4a Patch
https://hackerone.com/reports/310443 ExploitThird Party Advisory
https://security.netapp.com/advisory/ntap-20190919-0004/ Third Party Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2018-3721), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.