CVE-2025-61686

Published Jan 10, 2026

Last updated a month ago

CVSS critical 9.1

React Router

Overview

Description: 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.
Source: security-advisories@github.com
NVD status: Analyzed
Products: react-router\/node, remix-run\/deno, remix-run\/node

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.1
Impact score: 5.2
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Severity: CRITICAL

Weaknesses

security-advisories@github.com: CWE-22

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:shopify:react-router\\/node:*:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "1E0C856C-476D-482F-8047-7F4D5F0B4204",
            "versionEndExcluding": "7.9.4",
            "versionStartIncluding": "7.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:shopify:remix-run\\/deno:*:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "B47283CD-6965-448D-98CA-2A1BEED89A74",
            "versionEndExcluding": "2.17.2",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:shopify:remix-run\\/node:*:*:*:*:*:node.js:*:*",
            "matchCriteriaId": "C506FB64-B70B-40CF-8A14-C7BA394D1814",
            "versionEndExcluding": "2.17.2",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References