algoliasearch-helper is vulnerable to Prototype Pollution in _merge()

Description

Versions of the package algoliasearch-helper from 2.0.0-rc1 and before 3.11.2 are vulnerable to Prototype Pollution in the _merge() function in merge.js, which allows constructor.prototype to be written even though doing so throws an error.

Recommendation

Update the algoliasearch-helper package to the latest compatible version. Followings are version details:

• Affected version(s): >= 2.0.0-rc1, < 3.11.2
• Patched version(s): 3.11.2

References

• GHSA-529q-4j3p-7c5r
• security.snyk.io
• CVE-2025-3193
• CWE-1321
• CAPEC-310
• OWASP 2021-A6

Related Issues

• rollbar vulnerable to Prototype Pollution in merge() - CVE-2025-62517
• Prototype Pollution in algoliasearch-helper - CVE-2021-23433
• axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge - CVE-2026-44495
• mpregular vulnerable to prototype pollution - CVE-2025-57323

You might also like:

How to Secure your NodeJs Express Javascript Application - part 1

How to Secure your NodeJs Express Javascript Application - part 2

10 Secure Coding Best Practices to Follow in Every Project

Tags:

npm

algoliasearch-helper