Description
matrix-rust-sdk is an implementation of a Matrix client-server library in Rust. matrix-sdk-crypto since version 0.8.0 and up to 0.11.0 does not correctly validate the sender of an encrypted event. Accordingly, a malicious homeserver operator can modify events served to clients, making those events appear to the recipient as if they were sent by another user. This vulnerability is fixed in 0.11.1 and 0.12.0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| matrix-org | matrix-rust-sdk | >= 0.8.0, < 0.11.1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | fractal | 11.2-1.1 | openSUSE-SU-2025:15218-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| crates.io | matrix-sdk-crypto | >= 0.8.0, < 0.11.1 | 0.11.1 | GHSA-x958-rvg6-956w |
Advisories 1
- openSUSE-SU-2025:15218-1 fractal-11.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
References
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w
- https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55
- https://github.com/matrix-org/matrix-rust-sdk/commit/56980745b4f27f7dc72ac296e6aa003e5d92a75b
- https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2