CVE-2018-16487

Prototype Pollution in lodash

Description

Versions of `lodash` before 4.17.11 are vulnerable to prototype pollution.

The vulnerable functions are 'defaultsDeep', 'merge', and 'mergeWith' which allow 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 4.17.11 or later.

Patch Available

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

Fix without upgrading

Vulnerability Details

Score

Score Vector

Affected Versions

lodash < 4.17.11; lodash-rails < 4.17.11

Severity

Ecosystem

RubyGems

Publish Date

February 7, 2019

Modified Date

August 12, 2025