CVE-2021-23433: Algolia Algoliasearch-Helper

Critical severity, CVSS 9.8. EPSS: 1.6% chance of exploitation in the next 30 days.

The package algoliasearch-helper before 3.6.2 are vulnerable to Prototype Pollution due to use of the merge function in src/SearchParameters/index.jsSearchParameters._parseNumbers without any protection against prototype properties. Note that this vulnerability is only exploitable if the implementation allows users to define arbitrary search patterns.

Affected products

• Algolia Algoliasearch-Helper: before 3.6.2 (fixed in 3.6.2)

Published 2021-11-19. Last modified 2026-06-17.