Allocation of Resources Without Limits or Throttling Affecting react-router package, versions >=7.0.0 <7.14.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-REACTROUTER-17138883
- published3 Jun 2026
- disclosed2 Jun 2026
- creditOceandust
Introduced: 2 Jun 2026
CVE-2026-34077 (opens in a new tab)How to fix?
Upgrade react-router to version 7.14.0 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in the serialization algorithm in the PrefetchPageLinks() function. An attacker can cause a denial of service by supplying specially crafted user input that is reflected and processed during single-fetch operations.
Note:
Users that utilise Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) are not affected by this issue.