Vulnerability library
Security checkJanuary 11, 2026

React Router has Path Traversal in File Session Storage

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High severitynpm@remix-run/deno

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Description

If applications use createFileSessionStorage() 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.

Recommendation

Update the @remix-run/deno package to the latest compatible version. Followings are version details:

  • Affected version(s): <= 2.17.1
  • Patched version(s): 2.17.2

References

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See something that needs correcting? Let us knowUpdated January 11, 2026