Provide references for CVE-2021-29433.
Where can I find more information about CVE-2021-29433?
References are available at: https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553, https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da.