← Back
CVE-2026-44837
medium
CVSS 5.9
Vulnerability in view_component (CVE-2026-44837)
Summary
vulnerability in view_component (CVE-2026-44837). Confidential information can be exposed externally. Exploitable via `GET /_system_test_entrypoint`. Mitigation: upgrade to `4.9.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-44837** has been found in view_component.
Attackers can target a specific entry point like `GET /_system_test_entrypoint` over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 5.9/10.
What to do: upgrade view_component to **4.9.0** or later.
If unsure, ask your IT team or search "view_component CVE-2026-44837" on the vendor's site.
CVE-2026-44837 (view_component) — CWE-187 / CVSS v3 5.9
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: GET /_system_test_entrypoint / `File.realpath` / `base_path` / `realpath`
Patched: `4.9.0` — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
❓ What is the problem
**A vulnerability** (CWE-187) exists in view_component. Attackers reach the vulnerable code path via `GET /_system_test_entrypoint` without authentication.
📍 Affected scope
view_component — . Attack surface: GET /_system_test_entrypoint / `File.realpath` / `base_path` / `realpath`.
🔥 Severity
Severity: Medium (CVSS 5.9/10). Confidential information can be exposed externally
🔧 How to fix
Update to **4.9.0**.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual `GET /_system_test_entrypoint` requests with malformed payloads or SQL meta-characters. Run `grep -r 'view_component' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'view_component' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で `view_component` を grep し、稼働しているサービス・バージョンを把握する。
-
3Hunt for indicators of compromise detect
grep 'GET /_system_test_entrypoint' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで `GET /_system_test_entrypoint` への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。
-
6Apply patch patch
Upgrade view_component to 4.9.0ステージング環境で 4.9.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
-
7Post-deployment verification verify
Replay attack against GET /_system_test_entrypoint on staging to confirm patch closes the vectorパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番では Step 3 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
rubygems
view_component
[{"type":"ECOSYSTEM","events":[{"introduced":"3.0.0"},{"fixed":"4.9.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-44837
- package https://github.com/ViewComponent/view_component
- web https://github.com/ViewComponent/view_component/security/advisories/GHSA-hg3h-g7xc-f7vp
- web https://github.com/advisories/GHSA-hg3h-g7xc-f7vp
- web https://github.com/rubysec/ruby-advisory-db/blob/master/gems/view_component/CVE-2026-44837.yml