high7.5
CVE-2025-66622
matrix-sdk-base denial of service via custom m.room.join_rules event values
Impact
The matrix-sdk-base crate is 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. ### Patches The issue is fixed in matrix-sdk-base 0.16.0. ### Workarounds Users can leave affected rooms on another client to mitigate the issue. ### References The issue was fixed in https://github.com/matrix-org/matrix-rust-sdk/pull/5924.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| rust | matrix-sdk-base | < 0.16.0 | 0.16.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Matrix | Matrix-Rust-Sdk | before 0.16.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/matrix-org/matrix-rust-sdk/commit/4ea0418abefab2aa93f8851a4d39c723e703e6b0
- https://github.com/matrix-org/matrix-rust-sdk/pull/5924
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-jj6p-3m75-g2p3
- https://rustsec.org/advisories/RUSTSEC-2025-0135.html
- https://github.com/advisories/GHSA-jj6p-3m75-g2p3
- https://nvd.nist.gov/vuln/detail/CVE-2025-66622