Two new view_component gem advisories

gems/view_component/CVE-2026-54497.yml

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+---
+gem: view_component
+cve: 2026-54497
+ghsa: 9h85-g7w3-rh49
+url: https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54497
+title: Reused Component Instances Retain Stale Render Context
+date: 2026-06-04
+description: |
+  ## Summary
+
+  ViewComponent::Base instances retain multiple 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.
+cvss_v3: 6.8
+unaffected_versions:
+  - "< 4.0.0"
+patched_versions:
+  - ">= 4.12.0"
+related:
+  url:
+    - https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54497
+    - https://github.com/ViewComponent/view_component/releases/tag/v4.12.0
+    - https://github.com/ViewComponent/view_component/security/advisories/GHSA-9h85-g7w3-rh49
+notes: |
+  - cvss_v3 came from GHSA.
+  - CVE is reserved, but not published so no non-GHSA cvss values.

gems/view_component/CVE-2026-54498.yml

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+---
+gem: view_component
+cve: 2026-54498
+ghsa: 97jw-64cj-jc58
+url: https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54498
+title: around_render HTML-Safety Bypass
+date: 2026-06-04
+description: |
+  ## Summary
+
+  ViewComponent::Base#around_render can return HTML-unsafe strings that
+  bypass the escaping behavior applied to normal #call return values.
+  This creates an XSS risk when downstream applications use around_render
+  to wrap, replace, instrument, or conditionally return content that
+  includes user-controlled data.
+
+  The issue is especially dangerous in collection rendering because
+  ViewComponent::Collection#render_in joins the per-item results and
+  marks the entire output as html_safe, converting raw unsafe
+  output into a trusted ActiveSupport::SafeBuffer.
+cvss_v3: 8.7
+unaffected_versions:
+  - "< 4.0.0"
+patched_versions:
+  - ">= 4.12.0"
+related:
+  url:
+    - https://www.cve.org/CVERecord/SearchResults?query=CVE-2026-54498
+    - https://github.com/ViewComponent/view_component/releases/tag/v4.12.0
+    - https://github.com/ViewComponent/view_component/security/advisories/GHSA-97jw-64cj-jc58
+notes: |
+  - cvss_v3 came from GHSA.
+  - CVE is reserved, but not published so no non-GHSA cvss values.