What is CVE-2024-45193?

CVE-2024-45193 is a medium-severity vulnerability in Matrix Olm, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.3/10. Published 2024-08-22.

How severe is CVE-2024-45193?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Matrix Olm

CVE-2024-45193

An issue was discovered in Matrix libolm through 3.2.16. There is Ed25519 signature malleability due to lack of validation criteria (does not ensure that S < n). This refers to the libolm implementation of Olm. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

Vulnerability class: POODLE (CVE-2014-3566)

Published 2024-08-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000

Affected products

Matrix Olm

Weakness classification (CWE)

CWE-327 — Use of a Broken or Risky Cryptographic Algorithm

References

soatok.blog/2024/08/14/security-issues-in-matrixs-olm-library/ (Exploit)
gitlab.matrix.org/matrix-org/olm/ (Product)
news.ycombinator.com/item (Issue Tracking)
gitlab.matrix.org/matrix-org/olm/-/commit/6d4b5b07887821a95b144091c8497d09d377f… (Patch)

Frequently asked questions

What is CVE-2024-45193?: CVE-2024-45193 is a medium-severity vulnerability in Matrix Olm, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 4.3/10. Published 2024-08-22.
How severe is CVE-2024-45193?: Medium severity. CVSS v3 base score is 4.3 out of 10.