Prototype Pollution in lodash.defaultsdeep

Description

Versions of lodash.defaultsdeep before 4.6.1 are vulnerable to Prototype Pollution. The function ‘defaultsDeep’ may 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.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-46fh-8fc5-xcwx
• www.npmjs.com
• CWE-1321

Related Issues

• Angular vulnerable to Cross-site Scripting - CVE-2020-7676
• rollbar vulnerable to prototype pollution - CVE-2025-57325
• csvjson vulnerable to prototype injection - CVE-2025-57318
• Prebid.js NPM package briefly compromised - CVE-2025-59038

Tags:

npm

lodash.defaultsdeep