CVE-2025-49595: N8n Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-pr9r-gxgp-9rm8
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CVSS 4.9
CWE-400
Published
Advisory Summary

CVE-2025-49595 is a MODERATE (CVSS 4.9) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting N8n libraries in the npm ecosystem. The issue involves n8n vulnerable to denial of service via malformed binary data requests. Remediation is available by upgrading affected packages to version 1.99.0.

CVE-2025-49595 at a Glance

CVE Identifier CVE-2025-49595
GHSA Identifier GHSA-pr9r-gxgp-9rm8
Severity MODERATE
CVSS v3.1 Base Score 4.9
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product N8n
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 4.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2025-49595

To remediate this vulnerability, upgrade all affected N8n dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

n8n fixed: 1.99.0 
npm install n8n@1.99.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls n8n

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-49595, inspect your project dependencies using npm:

npm ls n8n

Analyze the terminal output to locate any version of N8n in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.99.0), your application is affected.

Note: The npm ls n8n command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In N8n, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

## 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](https://github.com/n8n-io/n8n/releases/tag/n8n%401.99.0). 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

CVE-2025-49595 Affected N8n Versions

1 component(s)
Fixed Versions:
1.99.0
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 1.99.0
1.99.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-pr9r-gxgp-9rm8
NVD — CVE-2025-49595 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-49595
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n/pull/16229
Security Fix Commit FIX COMMIT
https://github.com/n8n-io/n8n/commit/43c52a8b4f844e91b02e3cc9df92826a2d7b6052
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n

Frequently Asked Questions

What is CVE-2025-49595?
CVE-2025-49595 is a security vulnerability in N8n involving n8n Vulnerable to Denial of Service via Malformed Binary Data Requests under CWE-400: Uncontrolled Resource Consumption.
Which N8n versions are affected?
Affected versions include releases prior to 1.99.0 across affected packages: n8n.
What version fixes CVE-2025-49595?
Upgrading to 1.99.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 1.99.0. Upgrade your dependency to 1.99.0 or later.
What is the CVSS score of CVE-2025-49595?
CVE-2025-49595 has a CVSS v3.1 base score of 4.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2025-49595?
CVE-2025-49595 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2025-49595?
Run the dependency tree command: 'npm ls n8n'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-pr9r-gxgp-9rm8",
  "modified" : "2025-07-03T16:20:44Z",
  "published" : "2025-07-03T14:06:01Z",
  "aliases" : [ "CVE-2025-49595" ],
  "summary" : "n8n Vulnerable to Denial of Service via Malformed Binary Data Requests",
  "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",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.99.0"
      } ]
    } ]
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-07-03T14:06:01Z",
    "nvd_published_at" : "2025-07-03T13:15:28Z"
  }
}