CVE-2026-44837

MEDIUM

view_component: System Test Entry Point Path Check Allows Sibling Directory Escape

Title source: cna
STIX 2.1

Description

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.

References (1)

Core 1
Core References

Scores

CVSS v3 5.9
EPSS 0.0041
EPSS Percentile 33.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-187
Status published
Products (3)
rubygems/view_component 3.0.0 - 4.9.0RubyGems
viewcomponent/view_component 3.0.0 - 4.9.0
ViewComponent/view_component >= 3.0.0, < 4.9.0
Published May 26, 2026
Tracked Since May 27, 2026