CVE-2025-61686: @react router/node Path Traversal Vulnerability
CRITICALCVE-2025-61686 is a CRITICAL (CVSS 9.1) path traversal vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) affecting @react router/node libraries in the npm ecosystem. The issue involves react router has path traversal in file session storage. Remediation is available by upgrading affected packages to version 7.9.4, 2.17.2.
CVE-2025-61686 at a Glance
Security Impact
CVSS: 9.1
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H).
How to Fix CVE-2025-61686
To remediate this vulnerability, upgrade all affected @react router/node dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install @react-router/node@7.9.4npm install @remix-run/node@2.17.2npm install @remix-run/deno@2.17.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls @react-router/nodeHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2025-61686, inspect your project dependencies using npm:
npm ls @react-router/nodeAnalyze the terminal output to locate any version of @react router/node in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 7.9.4), your application is affected.
Note: The npm ls @react-router/node command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'), where the product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. In @react router/node, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2025-61686 Affected @react router/node Versions
3 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
@react-router/node
|
npm |
≥ 7.0.0
< 7.9.4
|
7.9.4
|
|
@remix-run/node
|
npm |
< 2.17.2
|
2.17.2
|
|
@remix-run/deno
|
npm |
< 2.17.2
|
2.17.2
|
References
Frequently Asked Questions
What is CVE-2025-61686?
Which @react router/node versions are affected?
What version fixes CVE-2025-61686?
Is @react-router/node affected?
Is @remix-run/node affected?
What is the CVSS score of CVE-2025-61686?
What CWE is associated with CVE-2025-61686?
How can I check npm dependencies for CVE-2025-61686?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9583-h5hc-x8cw",
"modified" : "2026-09-18T21:03:27Z",
"published" : "2026-01-08T20:45:07Z",
"aliases" : [ "CVE-2025-61686" ],
"summary" : "React Router has Path Traversal in File Session Storage",
"details" : "If applications use `createFileSessionStorage()` from `@react-router/node` (or `@remix-run/node`/`@remix-run/deno` in Remix v2) with an [**unsigned cookie**](https://reactrouter.com/explanation/sessions-and-cookies#signing-cookies), 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. \n\nRead 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.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "@react-router/node"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "7.0.0"
}, {
"fixed" : "7.9.4"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 7.9.3"
}
}, {
"package" : {
"ecosystem" : "npm",
"name" : "@remix-run/node"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.17.2"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 2.17.1"
}
}, {
"package" : {
"ecosystem" : "npm",
"name" : "@remix-run/deno"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.17.2"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 2.17.1"
}
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/remix-run/react-router/security/advisories/GHSA-9583-h5hc-x8cw"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-61686"
}, {
"type" : "WEB",
"url" : "https://access.redhat.com/security/cve/CVE-2025-61686"
}, {
"type" : "WEB",
"url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2428423"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/remix-run/react-router"
}, {
"type" : "WEB",
"url" : "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-61686.json"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-01-08T20:45:07Z",
"nvd_published_at" : "2026-01-10T03:15:48Z"
}
}