{"action":"Upgrade matrix-synapse to 1.23.1 or later.","affected":[{"fixed":"1.23.1","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2020-26257"],"ecosystem":"PyPI","epss":0.02392,"exploited":false,"fixed_versions":["1.23.1"],"ghsa_id":"GHSA-hxmp-pqch-c8mm","id":"tcs_01M5KG9YZJJ7XSN8SFSYB8JQGM","modified_at":"2023-11-08T04:03:16.626703Z","published_at":"2020-12-09T19:15:00Z","references":["https://osv.dev/vulnerability/PYSEC-2020-236","https://github.com/matrix-org/synapse/security/advisories/GHSA-hxmp-pqch-c8mm","https://github.com/matrix-org/synapse/commit/3ce2f303f15f6ac3dc352298972dc6e04d9b7a8b","https://github.com/matrix-org/synapse/blob/develop/CHANGES.md#synapse-1231-2020-12-09","https://github.com/matrix-org/synapse/pull/8776","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QR4MMYZKX5N5GYGH4H5LBUUC5TLAFHI7/","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DBTIU3ZNBFWZ56V4X7JIAD33V5H2GOMC/"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2020-236","url":"https://osv.dev/vulnerability/PYSEC-2020-236"}],"summary":"Matrix is an ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference \"homeserver\" implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed ev"}