olm dependency deprecation: CVE-2022-39255 and CVE-2024-45193

Problem

Multiple vulnerabilities were disclosed in 2024 affecting libolm (Olm): AES timing / side‑channel, Ed25519 signature malleability, and timing leaks in base64 decoding; several CVEs were assigned. Patches and mitigations were published; maintainers recommend upgrading to fixed versions. In addition, a 2022 “Olm/Megolm protocol confusion” advisory affecting some SDKs was critical and required client-side fixes. Use patched versions of libolm and up-to-date Matrix SDKs; avoid unpatched clients/servers.

Olm is a dependency of matrix-commander (Python version, not Rust version).

WARNING:

Due to cryptographic olm dependency deprecation, this program is cryptographically unsafe to use until matrix-nio/matrix-nio#555 is merged. Good news: https://github.com/8go/matrix-commander-rs is a Rust alternative not having this issue.

References

• CVE-2022-39255
• CVE-2024-45193
• https://soatok.blog/2024/08/14/security-issues-in-matrixs-olm-library/
• https://nvd.nist.gov/nvd.cfm?cvename=CVE-2024-45193
• GHSA-hw6g-j8v6-9hcm

Workarounds

• use the Rust version: https://github.com/8go/matrix-commander-rs

Severity:

Medium

CVE-2022-39255 — MEDIUM (NVD/MITRE lists CVSS base score 5.x — treated as Medium).

CVE-2024-45193 — MEDIUM (NVD shows CVSS 3.1 base score ~4.3 — Medium)