algoliasearch-helper is vulnerable to Prototype Pollution in _merge()
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.
NOTE: This vulnerability is not exploitable in the default configuration of InstantSearch since searchParameters are not modifiable by users.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | algoliasearch-helper | >= 2.0.0-rc1, < 3.11.2 | 3.11.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-3193
- https://github.com/algolia/algoliasearch-helper-js/issues/922
- https://github.com/algolia/algoliasearch-helper-js/commit/776dff23c87b0902e554e02a8c2567d2580fe12a
- https://github.com/algolia/algoliasearch-helper-js
- https://security.snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-3318396
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
algoliasearch-helper- Disclosed
- 27.09.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-529q-4j3p-7c5r - CC BY 4.0
Vulnerability history: algoliasearch-helper
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 11.2021 09.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- Medium 1
Disclosures per year
- 2021: 1
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 0
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algoliasearch-helper is vulnerable to Prototype Pollution in _merge() this entry
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