CVE-2026-54497: view_component: Reused Component Instances Retain Stale Render Context

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-07-17 · updated 2026-10-24
Weakness: CWE-362

Description

view_component is a framework for building reusable, testable, and encapsulated view components in Ruby on Rails. From 4.0.0 until 4.12.0, ViewComponent::Base instances retain render-scoped objects across calls to render_in; if the same component, collection, or spacer component instance is reused across requests, users, tenants, or threads, later renders can use stale helpers, controller, request, view_flow, format/variant details, and slot child context from an earlier render. This can cause authorization-aware components to render privileged UI for a lower-privileged user, generate links using a stale Host header, leak slot/helper state, and mix request context under concurrent rendering. This issue is fixed in version 4.12.0.

Affected products

ViewComponent view_component: from 4.0.0 before 4.12.0 — fixed in 4.12.0

How to fix

Upgrade to a fixed version: ViewComponent view_component 4.12.0. Check the vendor advisory for mitigations.

References

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