Prototype Pollution in lodash

Description

Versions of lodash before 4.17.5 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 __proto__ causing the addition or modification of an existing property that will exist on all objects.

Recommendation

Update the lodash package to the latest compatible version. Followings are version details:

• Affected version(s): < 4.17.5
• Patched version(s): 4.17.5

References

• GHSA-fvqr-27wr-82fm
• hackerone.com
• security.netapp.com
• CVE-2018-3721
• CWE-1321
• CWE-471
• CAPEC-310
• OWASP 2021-A3
• OWASP 2021-A6

Related Issues

• Prototype Pollution in lodash (GHSA-4xc9-xhrj-v574) - CVE-2018-16487
• Lodash has Prototype Pollution Vulnerability in `_.unset` and `_.omit` functions - CVE-2025-13465
• Prototype Pollution in just-extend - CVE-2018-16489
• Prototype Pollution in extend - CVE-2018-16492

Tags:

npm

lodash