High severity · published Jun 2, 2026
CVE-2026-42342
React Router vulnerable to DoS via unbounded path expansion in __manifest endpoint
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
React Router is a router for React. In versions 7.0.0 through 7.14.x of react-router and versions 2.10.0 through 2.17.4 of @remix-run/server-runtime, certain crafted requests can consume disproportionate server resources via unbounded path expansion in the __manifest endpoint, resulting in response time degradation and/or service unavailability for end users. This affects React Router Framework Mode applications as well as Remix applications. This does not impact applications using Declarative Mode (`<BrowserRouter>`) or Data Mode (`createBrowserRouter/<RouterProvider>`). This is patched in react-router version 7.15.0 and @remix-run/server-runtime version 2.17.5.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
@remix-run/server-runtime · remix-run
>= 2.10.0, < 2.17.5 · source: vendor
RE
react-router · remix-run
>= 7.0.0, < 7.15.0 · source: vendor, NVD
RE
Remix-run/server-runtime · Shopify
2.10.0 before 2.17.5 · source: NVD