Provide references for CVE-2021-21274.
Where can I find more information about CVE-2021-21274?
References are available at: https://github.com/matrix-org/synapse/security/advisories/GHSA-2hwx-mjrm-v3g8, https://github.com/matrix-org/synapse/releases/tag/v1.25.0, https://github.com/matrix-org/synapse/pull/8950, https://github.com/matrix-org/synapse/commit/ff5c4da1289cb5e097902b3e55b771be342c29d6, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/.