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Vulnerabilities

Vulnerability · CVE-2025-61686

React Router is a router for React.

Published Jan 10, 2026 · catalog updated Jul 15, 2026 · React Router is a

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Check this week

CVE-2025-61686 is not in CISA KEV. FIRST estimates a 17.35% chance of exploitation in the next 30 days. Check whether you run React Router is a.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (React Router is a).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
17.35%
Remediation
Version ranges on file
Affected products
vendor remix-run react-router @react-router/node 7.0.0, < 7.9.4

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor remix-run react-router @react-router/node 7.0.0, < 7.9.4@react-router/node 7.0.0, < 7.9.4

How to fix CVE-2025-61686

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2025-61686 is not in CISA KEV. FIRST estimates a 17.35% chance of exploitation in the next 30 days. Check whether you run React Router is a.

Which versions are affected?

Compare what you have installed with remix-run react-router @react-router/node 7.0.0, < 7.9.4 @react-router/node 7.0.0, < 7.9.4. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 17.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

React security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jan 10, 2026 · EUVD

    Detected

    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 loca

  2. Jul 15, 2026 · EUVD

    Updated

    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 loca

Sources

  • CVE.orgVulnerability recordCVE-2025-61686

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-61686

    30-day exploitation probability 17.35%

    first.org
  • EUVDVulnerability recordEUVD-2026-1468

    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

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 7, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 7, 2026
  • CVE.orgOct 29, 2026
  • EUVDOct 29, 2026