GHSA-PR9R-GXGP-9RM8

Vulnerability from github – Published: 2025-07-03 14:06 – Updated: 2025-07-03 16:20
VLAI
Summary
n8n Vulnerable to Denial of Service via Malformed Binary Data Requests
Details

Summary

Denial of Service vulnerability in /rest/binary-data endpoint when processing empty filesystem URIs (filesystem:// or filesystem-v2://).

Impact

This is a Denial of Service (DoS) vulnerability that allows authenticated attackers to cause service unavailability through malformed filesystem URI requests. The vulnerability affects:

  • The /rest/binary-data endpoint
  • n8n.cloud instances (confirmed HTTP/2 524 timeout responses)

Attackers can exploit this by sending GET requests with empty filesystem URIs (filesystem:// or filesystem-v2://) to the /rest/binary-data endpoint, causing resource exhaustion and service disruption.

Patches

The issue has been patched in 1.99.0. All users should upgrade to this version or later.

The fix introduces strict checking of URI patterns.

Patch commit: https://github.com/n8n-io/n8n/pull/16229

Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "n8n"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.99.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-49595"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-07-03T14:06:01Z",
    "nvd_published_at": "2025-07-03T13:15:28Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\nDenial of Service vulnerability in `/rest/binary-data` endpoint when processing empty filesystem URIs (`filesystem://` or `filesystem-v2://`).\n\n### Impact\nThis is a Denial of Service (DoS) vulnerability that allows authenticated attackers to cause service unavailability through malformed filesystem URI requests. The vulnerability affects:\n\n- The `/rest/binary-data` endpoint\n- n8n.cloud instances (confirmed HTTP/2 524 timeout responses)\n\nAttackers can exploit this by sending GET requests with empty filesystem URIs (`filesystem://` or `filesystem-v2://`) to the `/rest/binary-data` endpoint, causing resource exhaustion and service disruption.\n\n### Patches\n\nThe issue has been patched in [1.99.0](https://github.com/n8n-io/n8n/releases/tag/n8n%401.99.0).\nAll users should upgrade to this version or later.\n\nThe fix introduces strict checking of URI patterns.\n\nPatch commit: https://github.com/n8n-io/n8n/pull/16229",
  "id": "GHSA-pr9r-gxgp-9rm8",
  "modified": "2025-07-03T16:20:44Z",
  "published": "2025-07-03T14:06:01Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-pr9r-gxgp-9rm8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49595"
    },
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/pull/16229"
    },
    {
      "type": "WEB",
      "url": "https://github.com/n8n-io/n8n/commit/43c52a8b4f844e91b02e3cc9df92826a2d7b6052"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/n8n-io/n8n"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "n8n Vulnerable to Denial of Service via Malformed Binary Data Requests"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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