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. In the "extreme edge-case" that the resulting error is caught, code injected into the user-supplied search parameter may be exeucted. This is related to but distinct from the issue reported in [CVE-2021-23433](https://security.snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421). **NOTE:** This vulnerability is not exploitable in the default configuration of InstantSearch since searchParameters are not modifiable by users.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/algolia/algoliasearch-helper-js/commit/776dff23c87b0902e554e02a8c2567d2580fe12a Patch
- https://github.com/algolia/algoliasearch-helper-js/issues/922 Exploit, Issue Tracking, Patch
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · algoliaNVD modified 2026-10-19 16:10
Affected (CPE criteria) 1
cpe:2.3:a:algolia:algoliasearch-helper:*:*:*:*:*:node.js:*:*
References 3
- https://github.com/algolia/algoliasearch-helper-js/commit/776dff23c87b0902e554e02a8c2567d2580fe12a Patch
- https://github.com/algolia/algoliasearch-helper-js/issues/922 Exploit, Issue Tracking, Patch
- https://security.snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-3318396 Exploit, Third Party Advisory