CVE-2019-10744

Prototype Pollution in lodash

Description

Versions of `lodash` before 4.17.12 are vulnerable to Prototype Pollution. The function `defaultsDeep` allows a malicious user to modify the prototype of `Object` via `{constructor: {prototype: {...}}}` causing the addition or modification of an existing property that will exist on all objects. ## Recommendation Update to version 4.17.12 or later.

Patch Available

Fix available through Seal Security. No upgrade required, protect your application instantly.

Fix without upgrading

Vulnerability Details

Score

9.1

Score Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected Versions

lodash < 4.17.12; lodash-es < 4.17.14; lodash-amd < 4.17.13; lodash.defaultsdeep < 4.6.1; lodash-rails < 4.17.12

Severity

Critical

Ecosystem

JavaScript

Publish Date

July 10, 2019

Modified Date

August 12, 2025