CVE-2026-54497: ViewComponent Component Instances Retain Stale Render Context
Summary
CVE-2026-54497: ViewComponent: Reused Component Instances Retain Stale Render Context. Affects view_component versions >= 4.0.0, < 4.12.0. Fixed in 4.12.0. How to fix ↓
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Background
ViewComponent is a Ruby library designed to facilitate the creation of reusable view components in Rails applications. It allows developers to encapsulate view logic and presentation in a modular way, enhancing code maintainability and reusability. However, the library has a vulnerability that arises from the reuse of component instances across different render contexts, leading to potential security issues.
Vulnerability Detail
The vulnerability in ViewComponent arises from the fact that instances of ViewComponent::Base can retain stale render context information when reused across different requests or user sessions. This can lead to unauthorized access to privileged UI elements, as components may render with outdated context, including helpers, controllers, and request data. The root cause is the mutable nature of component instances, which do not reset their state between renders, allowing for cross-user context mixing and potential privilege escalation.
How To Fix
Latest published version: 4.19.0 as of 23 Oct 2026
gem install view_component -v 4.19.0Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
4.12.0
This is the first release that contains the fix.
gem install view_component -v 4.12.0Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid reusing component instances across different render contexts. Instead, create new instances of components for each render call. For example, instead of reusing an existing component instance, instantiate a new one like this: MyComponent.new(...) for each render.
Conclusion
The vulnerability CVE-2026-54497 in the ViewComponent library poses a significant risk due to the reuse of component instances across different render contexts, leading to potential unauthorized access and privilege escalation. It is crucial to update to the patched version or implement the recommended workarounds to secure your application.
See every vulnerability recorded for view_component →
FAQ
The CVSS score of this vulnerability is 6.8, indicating a moderate level of severity.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file like package-lock.json, you can receive real-time alerts. You can also check your application using the Vulert playground without any signup.
The potential impacts include unauthorized access to privileged UI elements, leaking sensitive information, and cross-user context mixing, which can lead to privilege escalation.
Yes, you can mitigate the risk by ensuring that component instances are not reused across different render contexts and by creating new instances for each render.
If you cannot update the package immediately, implement the workaround of creating new component instances for each render to minimize the risk of stale context being used.
References
Related vulnerabilities
Recent vulnerabilities recorded for view_component.
