Answer in brief
CVE-2025-61686 records a Critical severity (CVSS 9.1) vulnerability in React Router has Path Traversal in File Session Storage. The current sources do not mark it as known exploited. The current feed maps remix-run/react-router (generic), @remix-run/deno (npm), @remix-run/deno (npm), @react-router/node (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps remix-run/react-router (generic), @remix-run/deno (npm), @remix-run/deno (npm), @react-router/node (npm) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| remix-run/react-routergeneric | @react-router/node >= 7.0.0, < 7.9.4 || @remix-run/deno < 2.17.2 || @remix-run/node < 2.17.2 | Not reported |
| @remix-run/denonpm | <=2.17.1 | 2.17.2 |
| @remix-run/denonpm | >=0 <2.17.2 | 2.17.2 |
| @react-router/nodenpm | >=7.0.0,<=7.9.3 | 7.9.4 |
| @react-router/nodenpm | >=7.0.0 <7.9.4 | 7.9.4 |
| @remix-run/nodenpm | <=2.17.1 | 2.17.2 |
| @remix-run/nodenpm | >=0 <2.17.2 | 2.17.2 |
Published upstream
Jan 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.