Prototype Pollution in lodash.mergewith (GHSA-5947-m4fg-xhqg)

Description

Versions of lodash.mergewith before 4.6.1 are vulnerable to Prototype Pollution. The function ‘mergeWith’ 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.mergewith package to the latest compatible version. Followings are version details:

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

References

• GHSA-5947-m4fg-xhqg
• www.npmjs.com
• CWE-1321

Related Issues

• Prototype Pollution in lodash.mergewith - Vulnerability
• Prototype Pollution in lodash.merge (GHSA-h726-x36v-rx45) - Vulnerability
• Lodash has Prototype Pollution Vulnerability in `_.unset` and `_.omit` functions (GHSA-xxjr-mmjv-4gpg) - CVE-2025-13465
• Lodash has Prototype Pollution Vulnerability in `_.unset` and `_.omit` functions (GHSA-xxjr-mmjv-4gpg) 2 - CVE-2025-13465

Tags:

npm

lodash.mergewith