CVE-2026-25138: Cern Rucio

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Prior to versions 35.8.3, 38.5.4, and 39.3.1, the WebUI login endpoint returns distinct error messages depending on whether a supplied username exists, allowing unauthenticated attackers to enumerate valid usernames. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

Affected products

• Cern Rucio: before 35.8.3 (fixed in 35.8.3); from 36.0.0, before 38.5.4 (fixed in 38.5.4); from 39.0.0, before 39.3.1 (fixed in 39.3.1)

Published 2026-02-25. Last modified 2026-06-17.