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CVE-2026-55685

React Router: Unauthenticated Denial of Service via Inefficient Route Matching

Published: Jul 27, 2026Updated: Aug 3, 2026 Sources: CVE List NVDCWE-400
7.5HIGH
NVD MITRE
EPSS Score
0.7%
Top 50.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React Router applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been fixed in version 7.18.0.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-400CWE-407

Affected Products

remix-run
oss-project
react-routerLibrary
OSS Libraries / web-framework
shopify
commercial·US
react-routerSaaS
Web & CMS Plugins / ecommerce-platform

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/remix-run/react-router/security/advisories/GHSA-chx6-hx7r-mcp5
github.com
https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78
github.com
https://github.com/remix-run/react-router/pull/15186
github.com
and 3 more references View all →

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