CVE-2025-61686Critical· 9.1▾ AbyssalPoC availableReact 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/…
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 50.1 · likelihood 3.5 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Jul 4.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
16%
16% → 18%
3 GitHub repos
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.
react-router/node >= 7.0.0, < 7.9.4remix-run/deno < 2.17.2remix-run/node < 2.17.2Upgrade past the affected range:
react-router/node 7.9.4remix-run/deno 2.17.2remix-run/node 2.17.2Affected packages:
@react-router/node >= 7.0.0, <= 7.9.3@remix-run/node <= 2.17.1@remix-run/deno <= 2.17.1Patched in:
@react-router/node 7.9.4@remix-run/node 2.17.2@remix-run/deno 2.17.2Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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