November 15, 2026

CVE Watchtower

CVE-2026-42342Shopify React-router Uncontrolled Resource Consumption

NVDCVSS scored by security-advisories@github.com

Vulnerability Summary

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.
Severity Level
HIGH(7.5)
Published Date
Jun 2, 2026
Last Modified
Jul 21, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.30%Probability
Root Weakness (CWE)
CWE-400: Uncontrolled Resource Consumption β†—
The product does not properly control the allocation and maintenance of a limited resource, enabling denial-of-service conditions.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Shopify React-router >= 7.0.0 and < 7.15.0
  • Shopify Remix-run\/server-runtime >= 2.10.0 and < 2.17.5
Patched Versions
  • Shopify React-router 7.15.0
  • Shopify Remix-run\/server-runtime 2.17.5

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run Shopify React-router and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Jun 2, 2026Published
  • Jul 21, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

External References

Data last checked: Nov 15, 2026 03:31 UTC