React Router Node
CVE-2025-61686
CRITICAL
GHSA-9583-h5hc-x8cw
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK
2 techniques across 2 tactics: Discovery, Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 9.1 (Critical). No auth, network vector, low complexity. The prerequisite (unsigned cookies) limits the attack surface but is a common misconfiguration. EPSS 0.03%. |
| Exploit ScenarioDerived | An attacker sets a session cookie with a value like ../../etc/passwd. The server reads the file as a session, leaking its contents in the response. For writes, the attacker causes session data to be written to arbitrary paths. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 12, 2026
React Router (@react-router/node 7.0.0-7.9.3) has a path traversal in file-based session storage when using unsigned cookies. Attackers can manipulate session file paths to read or write arbitrary files on the server.
Earlier versions of this analysis (1)
React Router file session storage has path traversal via unsigned cookies, enabling arbitrary file read/write.
RemediationAI
Update React Router or Remix. Sign session cookies to prevent tampering.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 3 packages in npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
When createFileSessionStorage() is used with unsigned cookies, the session ID from the cookie is used to construct the file path without sanitization (CWE-22). An attacker can set a session cookie with path traversal sequences to read or overwrite arbitrary files.
Know when React Router Node gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Primary rating from Vendor (github).
CVSS VectorVendor: github
Lifecycle Timeline
2DescriptionCVE.org
React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used 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. This issue has been patched in @react-router/node version 7.9.4, @remix-run/deno version 2.17.2, and @remix-run/node version 2.17.2.
Executive ViewAI
Organizations using React Router face critical risk from CVE-2025-61686, a path traversal vulnerability rated CVSS 9.1. This could allow attackers to access or modify files outside intended directories, potentially exposing sensitive configuration or credentials. Organizations should apply vendor updates immediately when available and implement compensating controls in the interim.
Apply vendor patch. If immediate patching is not feasible: (1) Restrict file upload functionality via WAF; (2) Implement allowlist-based file type validation; (3) Use chroot/containerization to limit filesystem access.
Threat Intelligence Overview
NVD
CVE.org
EPSS
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.
Affected Products (CPE)CVE.org
Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Affected |
| SUSE Linux Enterprise Server 16.0 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Affected |
| SUSE Manager Client Tools 15 | Affected |
| SUSE Manager Client Tools for SLE 15 | Affected |
| SUSE Multi-Linux Manager Client Tools for SLE 15 | Affected |
| openSUSE Leap 16.0 | Affected |
| SUSE Manager Proxy LTS 4.3 | Affected |
| SUSE Manager Proxy Module 4.3 | Affected |
| SUSE Enterprise Storage 6 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Affected |
| SUSE Manager Proxy Module 4.1 | Affected |
| SUSE Manager Proxy Module 4.2 | Affected |
| openSUSE Leap 15.3 | Affected |
| openSUSE Leap 15.4 | Affected |
| openSUSE Leap 15.5 | Affected |
| openSUSE Leap 15.6 | Affected |
| SUSE Multi Linux Manager Tools SLE-15 | Affected |
| ses/7.1/ceph/prometheus-server ses/7/ceph/prometheus-server suse/multi-linux-manager/5.2/x86_64/monitoring-prometheus | Affected |
Exploit-DB