After several cryptographic vulnerabilities in libolm were disclosed publicly, the Matrix Foundation has officially deprecated the library. olm-sys is a thin wrapper around libolm and is now deprecated and potentially vulnerable in kind.

Users of olm-sys and its higher-level abstraction, olm-rs, are highly encouraged to switch to vodozemac as soon as possible. It is the successor effort to libolm and is written in Rust.

References

• https://gitlab.gnome.org/BrainBlasted/olm-sys/-/issues/12
• https://matrix.org/blog/2024/08/libolm-deprecation
• https://rustsec.org/advisories/RUSTSEC-2024-0368.html