5 results · Clear filters · Feed
-
High 7.1
Synapse vulnerable to federation denial of service via malformed events
Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed…
-
High 7.5
Synapse denial of service through media disk space consumption
Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insu…
-
High 8.2
Synapse allows unsupported content types to lead to memory exhaustion
Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial…
-
High 8.7
Synapse allows a a malformed invite to break the invitee's `/sync`
Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync fun…
-
High 8.2
Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially untrustworthy decoders
Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoki…