CVE-2020-26257: Uncontrolled Resource Consumption
(updated )
Synapse is a reference homeserver implementation of Matrix. A malicious or poorly-implemented homeserver can inject malformed events into a room by specifying a different room id in the path of a /send_join
, /send_leave
, /invite
or /exchange_third_party_invite
request. This can lead to a denial of service in which future events will not be correctly sent to other servers over federation. This affects any server which accepts federation requests from untrusted servers.
References
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