CVE-2025-3193
📋 TL;DR
CVE-2025-3193 is a prototype pollution vulnerability in algoliasearch-helper's _merge() function that allows attackers to inject malicious code through user-supplied search parameters. This affects versions 2.0.0-rc1 through 3.11.1 when search parameters are modifiable by users. The vulnerability is not exploitable in default InstantSearch configurations.
💻 Affected Systems
- algoliasearch-helper
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or server takeover if error handling catches the pollution attempt and executes injected code.
Likely Case
Limited impact due to the extreme edge-case requirement and default InstantSearch protections, potentially causing application instability or denial of service.
If Mitigated
No impact when using default InstantSearch configuration or when user input validation prevents search parameter modification.
🎯 Exploit Status
Exploitation requires catching the error thrown during prototype pollution, making this an extreme edge-case scenario.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.11.2
Vendor Advisory: https://github.com/algolia/algoliasearch-helper-js/commit/776dff23c87b0902e554e02a8c2567d2580fe12a
Restart Required: No
Instructions:
1. Update algoliasearch-helper to version 3.11.2 or later. 2. Run 'npm update algoliasearch-helper' or 'yarn upgrade algoliasearch-helper'. 3. Test application functionality after update.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation to prevent users from modifying search parameters.
Use Default InstantSearch Configuration
allEnsure InstantSearch is used with default configuration where search parameters are not user-modifiable.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all user-supplied search parameters
- Use web application firewall rules to block suspicious search parameter patterns
🔍 How to Verify
Check if Vulnerable:
Check package.json for algoliasearch-helper version between 2.0.0-rc1 and 3.11.1, and verify if search parameters are user-modifiable.Check Version:
npm list algoliasearch-helperVerify Fix Applied:
Confirm algoliasearch-helper version is 3.11.2 or later in package.json and node_modules.📡 Detection & Monitoring
Log Indicators:
- Unusual search parameter patterns
- Error logs related to prototype pollution or merge.js
Network Indicators:
- HTTP requests with malformed search parameters containing prototype pollution patterns
SIEM Query:
search 'algoliasearch-helper' AND ('prototype' OR 'merge.js' OR 'searchParameters')