CVE-2025-66622 matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values

matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.joinrules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room wit...