November 15, 2026

CVE Watchtower

CVE-2026-34077Shopify React-router Allocation of Resources Without Limits or Throttling

NVDCVSS scored by security-advisories@github.com

Vulnerability Summary

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
Severity Level
HIGH(7.5)
Published Date
Jun 2, 2026
Last Modified
Jul 22, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.29%Probability
Root Weakness (CWE)
CWE-770: Allocation of Resources Without Limits or Throttling β†—
The product allocates a reusable resource on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated.
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 < 7.14.0
  • Turbo-stream Turbo Stream < 3.0.0
Patched Versions
  • Shopify React-router 7.14.0
  • Turbo-stream Turbo Stream 3.0.0

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 22, 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