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CVE-2020-8203

Prototype Pollution in lodash

Versions of lodash prior to 4.17.19 are vulnerable to Prototype Pollution. The functions `pick`, `set`, `setWith`, `update`, `updateWith`, and `zipObjectDeep` allow a malicious user to modify the prototype of Object if the property identifiers are user-supplied. Being affected by this issue requires manipulating objects based on user-provided property values or arrays.This vulnerability causes the addition or modification of an existing property that will exist on all objects and may lead to Denial of Service or Code Execution under specific circumstances.

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Vulnerability Details
Score
7.4
Score Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected Versions
lodash >= 3.7.0 < 4.17.19; lodash-es >= 3.7.0 < 4.17.20; lodash.pick >= 4.0.0; lodash.set >= 3.7.0; lodash-rails >= 3.7.0 < 4.17.19
Severity
High
Ecosystem
Publish Date
July 15, 2020
Modified Date
August 12, 2025