{"id":"CVE-2021-23433","aliases":["GHSA-vpf5-82c8-9v36"],"url":"https://o3.security/vulnerability/CVE-2021-23433","summary":"Prototype Pollution in algoliasearch-helper","details":"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.","published":"2021-11-19T20:15:17.903Z","modified":"2026-07-09T11:24:26.392773Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"algoliasearch-helper","fixedVersion":"3.6.2"}],"fix":{"url":"https://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817edd","label":"algolia/algoliasearch-helper-js@4ff542b"},"references":[{"type":"WEB","url":"https://github.com/algolia/algoliasearch-helper-js/blob/3.5.5/src/SearchParameters/index.js%23L291"},{"type":"FIX","url":"https://github.com/algolia/algoliasearch-helper-js/commit/4ff542b70b92a6b81cce8b9255700b0bc0817edd"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JS-ALGOLIASEARCHHELPER-1570421"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-09T11:24:26.392773Z"}}