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CVE-2026-33174
Vulnerability in activestorage (CVE-2026-33174)
Summary
vulnerability in activestorage (CVE-2026-33174). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `7.2.3.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-33174** has been found in activestorage.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade activestorage to **7.2.3.1** or later.
If unsure, ask your IT team or search "activestorage CVE-2026-33174" on the vendor's site.
CVE-2026-33174 (activestorage) — CWE-789 /
Patched: `7.2.3.1` — 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-789) exists in activestorage.
📍 Affected scope
activestorage — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **7.2.3.1**.
🛡️ 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 request patterns matching this CVE's known IOCs. Run `grep -r 'activestorage' .` 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
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1Identify exposure identify
grep -r 'activestorage' . | 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 `activestorage` を grep し、稼働しているサービス・バージョンを把握する。
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6Apply patch patch
Upgrade activestorage to 7.2.3.1ステージング環境で 7.2.3.1 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。
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7Post-deployment verification verify
Confirm patched version is live in production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
activestorage
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.2.3.1"}]}]
References
- web https://github.com/rails/rails/security/advisories/GHSA-r46p-8f7g-vvvg
- web https://github.com/rails/rails/commit/2cd933c366b777f873d4d590127da2f4a25e4ba5
- web https://github.com/rails/rails/commit/42012eaaa88dfc7d0030161b2bc8074a7bbce92a
- web https://github.com/rails/rails/commit/8159a9c3de3f27a2bcf2866b8bf9ceb9075e229b
- web https://github.com/rails/rails/releases/tag/v7.2.3.1
- web https://github.com/rails/rails/releases/tag/v8.0.4.1
- web https://github.com/rails/rails/releases/tag/v8.1.2.1
- web https://nvd.nist.gov/vuln/detail/CVE-2026-33174
- web https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activestorage/CVE-2026-33174.yml
- web https://github.com/advisories/GHSA-r46p-8f7g-vvvg