{"id":"CVE-2023-32323","summary":"Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites","details":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.","aliases":["GHSA-f3wc-3vxv-xmvr","PYSEC-2023-67"],"modified":"2026-08-12T03:51:12.157402210Z","published":"2023-05-26T13:32:01.632Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-20"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/32xxx/CVE-2023-32323.json"},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/32xxx/CVE-2023-32323.json"},{"type":"ADVISORY","url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-f3wc-3vxv-xmvr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-32323"},{"type":"REPORT","url":"https://github.com/matrix-org/synapse/issues/14492"},{"type":"FIX","url":"https://github.com/matrix-org/synapse/pull/14642"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/matrix-org/synapse","events":[{"introduced":"0"},{"fixed":"774e20b57047b9f8700e62e7f4689717f4fa094c"}],"database_specific":{"cpe":"cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.74.0"}],"source":["AFFECTED_FIELD","CPE_RANGE"]}}],"versions":["v1.74.0rc1","v1.63.0rc1","v1.62.0rc1","v1.52.0rc1","v1.49.0rc1","v1.40.0rc1","v1.36.0rc1","v1.35.0rc1","v1.34.0rc1","v1.32.0rc1","v1.31.0rc1","v1.30.0rc1","v1.29.0rc1","v1.27.0rc1","v1.24.0rc1","v1.23.0rc1","v1.17.0rc1","v1.18.0rc1","v1.16.0rc1","v1.15.0rc1","v1.14.0rc1","v1.12.0rc1","v1.6.0rc1","v1.11.0rc1","v1.3.0rc1","v1.1.0rc2","v1.1.0rc1","v1.10.0rc1","v1.9.0rc1","v1.9.0.dev2","v1.9.0.dev1","v1.8.0rc1","v1.5.0rc1","v1.4.0rc1","v0.99.5.1.dev0","v0.99.4rc1","v0.99.2rc1","v0.99.1rc1","hhs-8","hhs-7","hhs-6","hhs-5","hhs-3","hhs-2","hhs-1","v0.32.2","v0.32.0","v0.32.0rc1","v0.28.0-rc1","v0.25.0-rc1","v0.23.0-rc2","v0.23.0-rc1","v0.18.5","v0.18.4","v0.18.3","v0.18.2","v0.18.1","v0.18.0","v0.17.3","v0.17.2","v0.17.1","v0.17.0","v0.16.1-r1","v0.16.1","v0.16.0","v0.14.0","v0.13.3","v0.13.2","v0.13.1","v0.12.0","v0.11.1","v0.11.0-r2","v0.11.0-r1","v0.11.0","v0.10.0-r2","v0.10.0-r1","v0.10.0","v0.9.3","v0.9.2-r2","v0.9.2-r1","v0.9.2","v0.9.1","v0.9.0-r5","v0.9.0-r4","v0.9.0-r3","v0.9.0-r2","v0.9.0-r1","v0.9.0","v0.8.1-r4","v0.8.1-r3","v0.8.1-r2","v0.8.1-r1","v0.8.1","v0.8.0","v0.7.1-r4","v0.7.1-r3","v0.7.1-r2","v0.7.1-r1","v0.7.1","v0.7.0f","v0.7.0e","v0.7.0d","v0.7.0c","v0.7.0b","v0.7.0a","v0.7.0","v0.6.1f","v0.6.1e","v0.6.1d","v0.6.1c","v0.6.1b","v0.6.1a","v0.6.1","v0.6.0b","v0.6.0a","v0.6.0","v0.5.4a","v0.5.4","v0.5.3c","v0.5.3b","v0.5.3a","v0.5.3","v0.5.2","v0.5.1","v0.5.0","v0.4.2","v0.4.1","v0.3.4","v0.3.3","v0.3.0","v0.2.2","v0.2.1a","v0.2.1","v0.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-32323.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L"}]}