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CVE-2026-41690 high CVSS 8.6

Vulnerability in i18next-http-middleware (CVE-2026-41690)

Summary

vulnerability in i18next-http-middleware (CVE-2026-41690). Data can be tampered with by attackers. Exploitable via `GET /locales/resources.json`. Mitigation: upgrade to `3.9.3` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2026-41690** has been found in i18next-http-middleware. Attackers can target a specific entry point like `GET /locales/resources.json` over the network to misuse the product. Data can be tampered with by attackers. CVSS score: 8.6/10. What to do: upgrade i18next-http-middleware to **3.9.3** or later. If unsure, ask your IT team or search "i18next-http-middleware CVE-2026-41690" on the vendor's site.
CVE-2026-41690 (i18next-http-middleware) — CWE-1321 / CVSS v3 8.6 Attack vector: remote (network-reachable) / unauthenticated / no user interaction Attack surface: GET /locales/resources.json / `lng` / `getResourcesHandler` / `setPath` Patched: `3.9.3` — apply immediately Workaround: No workaround short of upgrading. 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-1321) exists in i18next-http-middleware. Attackers reach the vulnerable code path via `GET /locales/resources.json` without authentication.
📍 Affected scope
i18next-http-middleware — . Attack surface: GET /locales/resources.json / `lng` / `getResourcesHandler` / `setPath`.
🔥 Severity
Severity: High (CVSS 8.6/10). Data can be tampered with by attackers
🔧 How to fix
Update to **3.9.3**.
🛡️ Workaround
Workaround: No workaround short of upgrading.
🔍 Detection
Search webserver/proxy logs for unusual `GET /locales/resources.json` requests with malformed payloads or SQL meta-characters. Run `grep -r 'i18next-http-middleware' .` 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 'i18next-http-middleware' . | 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 `i18next-http-middleware` を grep し、稼働しているサービス・バージョンを把握する。

  2. 3
    Hunt for indicators of compromise detect
    grep 'GET /locales/resources.json' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'

    アクセスログで `GET /locales/resources.json` 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。

  3. 5
    Apply temporary workaround mitigate
    No workaround short of upgrading.

    パッチが適用されるまでの応急処置として、No workaround short of upgrading. を実施。回避策の副作用 (機能低下) を確認した上で。

  4. 6
    Apply patch patch
    Upgrade i18next-http-middleware to 3.9.3

    ステージング環境で 3.9.3 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。

  5. 7
    Post-deployment verification verify
    Replay attack against GET /locales/resources.json 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

npm i18next-http-middleware
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.9.3"}]}]

References

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