Provide references for CVE-2021-23423.
Where can I find more information about CVE-2021-23423?
References are available at: https://snyk.io/vuln/SNYK-PYTHON-BIKESHED-1537647, https://github.com/tabatkins/bikeshed/commit/b2f668fca204260b1cad28d5078e93471cb6b2dd.