py-matrix-synapse -- malformed events may prevent users from joining federated rooms
Affected Synapse versions assume that all events have an "origin" field set. If an event
without the "origin" field is sent into a federated room, servers not already joined to
the room will be unable to do so due to failing to fetch the malformed event.
An attacker could cause a denial of service by deliberately sending a malformed event
into a room, thus preventing new servers (and thus their users) from joining the
Copyright © 2003-2005 Jacques Vidrine and contributors.
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