CVE-2023-45129

Summary

CVE-2023-45129 is a vulnerability affecting Synapse, an open-source Matrix homeserver. Before version 1.94.0, malicious server Access Control List (ACL) events can cause temporary or permanent performance degradation, leading to a persistent Denial of Service (DoS) issue. Homeservers operating on a closed federation, which typically do not require server ACLs, are not susceptible. Server administrators are encouraged to upgrade to Synapse 1.94.0 or later to mitigate this risk. A temporary workaround involves purging and blocking rooms with malicious server ACL events using the admin API.

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