MEDIUM

CVE-2018-3721

CVSS v3

6.5

MEDIUM

EPSS Score

2.3 %

exploit probability, as of 2026-10-17

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

lodashnpmall versions · fixed in 4.17.5
lodash-railsRubyGemsall versions · fixed in 4.17.5

Vendor advisories

CVE-2018-3721 Red Hat Product Security1 product fixed · 4 known affected
lodash: Prototype pollution in utilities function
lodash-rails.src as a component of CloudForms Management Engine 5 · nodejs-lodash as a component of Red Hat OpenShift Enterprise 3 · nodejs-lodash.src as a component of Red Hat OpenShift Enterprise 3
RHSA-2021:3917 Red Hat Product Security1 product fixed
Red Hat Security Advisory: Red Hat Quay v3.6.0 security, bug fix and enhancement update

Full record on 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.

Technical details

Published: 2018-06-07

Frequently asked questions

What is CVE-2018-3721?

Is CVE-2018-3721 actively exploited?

Active exploitation of CVE-2018-3721 has not been confirmed. Its EPSS score was 2.3% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-3721?

CVE-2018-3721 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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