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CVE-2026-41316 high CVSS 8.1

Vulnerability in erb (CVE-2026-41316)

Summary

vulnerability in erb (CVE-2026-41316). Successful exploitation can lead to full system takeover. Exploitable via ``Marshal.load``. Mitigation: upgrade to `6.0.4` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-41316** has been found in erb. Attackers can target a specific entry point like ``Marshal.load`` over the network to misuse the product. Successful exploitation can lead to full system takeover. CVSS score: 8.1/10. What to do: upgrade erb to **6.0.4** or later. If unsure, ask your IT team or search "erb CVE-2026-41316" on the vendor's site.
CVE-2026-41316 (erb) — CWE-693 / CVSS v3 8.1 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: `Marshal.load` / `erb` / `nil` / `ERB.singleton_class` Patched: `6.0.4` — 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-693) exists in erb. Attackers reach the vulnerable code path via ``Marshal.load`` without authentication.
📍 Affected scope
erb — . Attack surface: `Marshal.load` / `erb` / `nil` / `ERB.singleton_class`.
🔥 Severity
Severity: High (CVSS 8.1/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **6.0.4**.
🛡️ 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 'erb' .` 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

  1. 1
    Identify exposure identify 
    grep -r 'erb' . | 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 `erb` を grep し、稼働しているサービス・バージョンを把握する。

  2. 6
    Apply patch patch 
    Upgrade erb to 6.0.4

    ステージング環境で 6.0.4 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。

  3. 7
    Post-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 erb
[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.2"},{"fixed":"6.0.4"}]}]

References

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