Provide references for CVE-2021-23568.
Where can I find more information about CVE-2021-23568?
References are available at: https://snyk.io/vuln/SNYK-JS-EXTEND2-2320315, https://github.com/eggjs/extend2/blob/master/index.js%23L50-L60, https://github.com/eggjs/extend2/commit/aa332a59116c8398976434b57ea477c6823054f8, https://github.com/eggjs/extend2/pull/2.