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CVE-2025-66622
Good to know:
Date: December 9, 2025
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.join_rules 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 with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.
Severity Score
Related Resources (8)
Severity Score
Weakness Type (CWE)
Improper Handling of Exceptional Conditions
CWE-755Top Fix
Upgrade Version
Upgrade to version matrix-sdk-base - 0.16.0;https://github.com/matrix-org/matrix-rust-sdk.git - matrix-sdk-base-0.16.0
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | REQUIRED |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | LOW |