Prototype Pollution in lodash.defaultsdeep (GHSA-h5mp-5q4p-ggf5)

Description

Versions of lodash.defaultsdeep before 4.6.1 are vulnerable to prototype pollution. The function mergeWith may 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 the lodash.defaultsdeep package to the latest compatible version. Followings are version details:

• Affected version(s): < 4.6.1
• Patched version(s): 4.6.1

References

• GHSA-h5mp-5q4p-ggf5
• www.npmjs.com
• CWE-1321

Related Issues

• Prototype Pollution in lodash.defaultsdeep - Vulnerability
• Lodash has Prototype Pollution Vulnerability in `_.unset` and `_.omit` functions (GHSA-xxjr-mmjv-4gpg) 3 - CVE-2025-13465
• Prototype Pollution in lodash (GHSA-jf85-cpcp-j695) 3 - CVE-2019-10744
• Lodash has Prototype Pollution Vulnerability in `_.unset` and `_.omit` functions (GHSA-xxjr-mmjv-4gpg) 2 - CVE-2025-13465

Tags:

npm

lodash.defaultsdeep