CVE-2024-45191: Matrix Olm

Medium severity, CVSS 5.3. EPSS: 0.5% chance of exploitation in the next 30 days.

An issue was discovered in Matrix libolm through 3.2.16. The AES implementation is vulnerable to cache-timing attacks due to use of S-boxes. This is related to software that uses a lookup table for the SubWord step. This refers to the libolm implementation of Olm. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Affected products

• Matrix Olm: up to and including 3.2.16

Published 2024-08-22. Last modified 2026-06-17.