CVE-2025-66622
matrix-sdk-base is vulnerable to DoS via custom m.room.join_rules event values
- State
- Published
- Severity
- 1.3 Low
- Published
- Dec 9, 2025
- Updated
- Dec 9, 2025
- Reserved
- Dec 5, 2025
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 1.3 Low | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U | GitHub_M |
Weaknesses
- CWE-755 Improper Handling of Exceptional Conditions
Affected Products
| Product | Versions |
|---|---|
matrix-rust-sdkmatrix-org |
|
References
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