Provide references for CVE-2021-43840.
Where can I find more information about CVE-2021-43840?
References are available at: https://github.com/discourse/message_bus/security/advisories/GHSA-xmgj-5fh3-xjmm, https://github.com/discourse/message_bus/commit/9b6deee01ed474c7e9b5ff65a06bb0447b4db2ba.