Disclosure summary
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.
Source-reported weakness categories
CWE-755
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2025-66622
Open original source · Updated Oct 07, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| matrix | matrix-rust-sdk | * {"versionEndExcluding":"0.16.0"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Patch
- github.com — Issue Tracking, Patch
- github.com — Patch, Vendor Advisory
- rustsec.org — Third Party Advisory
PUBLISHED 2025-12-09T11:18:21-05:00
MODIFIED 2026-10-07T16:10:01-04:00
INGESTED 2026-10-08T12:35:36-04:00