CVE-2026-44837: Viewcomponent View Component

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 3.0.0 to 4.9.0, the system test entrypoint canonicalizes a user-controlled file path with File.realpath, then checks whether the resolved path starts with the temp directory path. This is not a safe containment check because sibling directories can share the same string prefix. This vulnerability is fixed in 4.9.0.

Affected products

• Viewcomponent View Component: from 3.0.0, before 4.9.0 (fixed in 4.9.0)

Published 2026-05-26. Last modified 2026-07-24.