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CVE-2025-61686 critical CVSS 9.1

Path Traversal in @react-router/node (CVE-2025-61686)

Summary

Path traversal in @react-router/node (CVE-2025-61686). Data can be tampered with by attackers. Mitigation: upgrade to 7.9.4 or later.

Original description

The description as published by the source.

If applications use createFileSessionStorage() from @react-router/node (or @remix-run/node/@remix-run/deno in Remix v2) with an unsigned cookie, it is possible for an attacker to cause the session to try to read/write from a location outside the specified session file directory. The success of the attack would depend on the permissions of the web server process to access those files.

Read files cannot be returned directly to the attacker. Session file reads would only succeed if the file matched the expected session file format. If the file matched the session file format, the data would be populated into the server side session but not directly returned to the attacker unless the application logic returned specific session information.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2025-61686 has been found in @react-router/node.
Data can be tampered with by attackers. CVSS score: 9.1/10.
What to do: upgrade @react-router/node to 7.9.4 or later.
If unsure, ask your IT team or search "@react-router/node CVE-2025-61686" on the vendor's site.

CVE-2025-61686 (@react-router/node) — CWE-22 / CVSS v3 9.1
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 7.9.4 — 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

Path traversal (CWE-22) exists in @react-router/node.

📍 Affected scope

Check the vendor advisory for the affected versions of @react-router/node.

🔥 Severity

Severity: Critical (CVSS 9.1/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 7.9.4.

🛡️ 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 '@react-router/node' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

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

  2. 2
    Apply patch patch 
    Upgrade @react-router/node to 7.9.4

    ステージング環境で 7.9.4 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を含めること。

  3. 3
    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm @react-router/node
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.9.4"}]}]
npm @remix-run/node
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.17.2"}]}]
npm @remix-run/deno
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.17.2"}]}]

References

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