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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2025-61686)

ID	Name	Product	Family	Severity
436689	SCA: security update for @react-router/node, @remix-run/deno, @remix-run/node (GHSA-9583-h5hc-x8cw)	Tenable Cloud Security	SCA Checks	critical
436689	SCA: security update for @react-router/node, @remix-run/deno, @remix-run/node (GHSA-9583-h5hc-x8cw)	Tenable Self-Hosted Container Security	SCA Checks	critical

Detections

Analytics

CVE-2025-61686

critical

Tenable Plugins

critical

critical