CVE-2026-55685: CWE-400: Uncontrolled Resource Consumption in remix-run react-router
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.
AI Analysis
Technical Summary
CVE-2026-55685 is an uncontrolled resource consumption vulnerability in remix-run's react-router affecting versions 7.0.0 through 7.17.0. The manifest endpoint is exposed to unauthenticated requests that can impose heavy load on the server, leading to performance degradation. This vulnerability is a follow-up to CVE-2026-42342 and specifically excludes react-router applications using Declarative Mode or Data Mode. The issue was resolved in react-router version 7.18.0.
Potential Impact
Exploitation of this vulnerability allows unauthenticated attackers to send targeted requests to the manifest endpoint, causing excessive resource consumption on the server. This results in slowed response times and potential denial of service conditions due to server overload. There is no indication of code execution or data compromise from the provided data.
Mitigation Recommendations
Upgrade react-router to version 7.18.0 or later, where this vulnerability is fixed. Applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) are not affected by this issue. No other mitigations are specified. Patch status is confirmed fixed in 7.18.0.
CVE-2026-55685: CWE-400: Uncontrolled Resource Consumption in remix-run react-router
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.
CVSS v4.0
Score 8.7high
Affected software
remix-run
react-router
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-55685 is an uncontrolled resource consumption vulnerability in remix-run's react-router affecting versions 7.0.0 through 7.17.0. The manifest endpoint is exposed to unauthenticated requests that can impose heavy load on the server, leading to performance degradation. This vulnerability is a follow-up to CVE-2026-42342 and specifically excludes react-router applications using Declarative Mode or Data Mode. The issue was resolved in react-router version 7.18.0.
Potential Impact
Exploitation of this vulnerability allows unauthenticated attackers to send targeted requests to the manifest endpoint, causing excessive resource consumption on the server. This results in slowed response times and potential denial of service conditions due to server overload. There is no indication of code execution or data compromise from the provided data.
Mitigation Recommendations
Upgrade react-router to version 7.18.0 or later, where this vulnerability is fixed. Applications using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) are not affected by this issue. No other mitigations are specified. Patch status is confirmed fixed in 7.18.0.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T00:13:10.650Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a67d32d9c2644c7f8e4ddb5
Added to database: 07/27/2026, 21:52:45 UTC
Last enriched: 07/29/2026, 19:52:07 UTC
Last updated: 09/10/2026, 20:01:51 UTC
Views: 75
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