advisory-database/advisories/github-reviewed/2026/06/GHSA-rxv8-25v2-qmq8/GHSA-rxv8-25v2-qmq8.json at a1c093930735be898e89b41867f350f04852f42b · github/advisory-database · GitHub

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{
  "schema_version": "1.4.0",
  "id": "GHSA-rxv8-25v2-qmq8",
  "modified": "2026-06-04T15:23:51Z",
  "published": "2026-06-04T15:23:51Z",
  "aliases": [
    "CVE-2026-34077"
  ],
  "summary": "React Router vulnerable to Denial of Service via reflected user input in single-fetch",
  "details": "A DoS vulnerability exists in the React Router v7 [Framework Mode](https://reactrouter.com/start/modes#framework), as well as Remix v2.9.0+ with [Single Fetch](https://v2.remix.run/docs/guides/single-fetch) enabled. In some scenarios the underlying serialization algorithm can become a bottleneck when encoding specific types of data into server responses.  Please upgrade to React Router v7.14.0 or later.\n\n> [!NOTE]\n> This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#declarative) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "react-router"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.15"
            }
          ]
        }
      ],
      "database_specific": {
        "last_known_affected_version_range": "< 7.14.0"
      }
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "turbo-stream"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.0"
            }
          ]
        }
      ]
    }
  ],
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmq8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34077"
    },
    {
      "type": "WEB",
      "url": "https://github.com/remix-run/react-router/commit/59811921d3c7d599077b8cadccdcd65a233165e0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/flatten.ts#L175-L177"
    },
    {
      "type": "WEB",
      "url": "https://github.com/jacob-ebey/turbo-stream/blob/v2.4.1/src/unflatten.ts#L185-L189"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/remix-run/react-router"
    }
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "severity": "HIGH",
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-04T15:23:51Z",
    "nvd_published_at": "2026-06-02T20:16:34Z"
  }
}