CVE-2026-58661: n8n Authenticated Users Can Exhaust Temporary Vulnerability

MODERATE
Advisory Identifier: GHSA-w867-jm58-p9pv
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CWE-770
Published
Advisory Summary

CVE-2026-58661 is a MODERATE authenticated users can exhaust temporary vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting n8n libraries in the npm ecosystem. The issue involves authenticated users can exhaust temporary disk storage via data-table file uploads. Remediation is available by upgrading affected packages to version 2.28.0, 1.123.58.

CVE-2026-58661 at a Glance

CVE Identifier CVE-2026-58661
GHSA Identifier GHSA-w867-jm58-p9pv
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product n8n
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-58661

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: 2.28.0 
npm install n8n@2.28.0
n8n fixed: 1.123.58 
npm install n8n@1.123.58
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-2026-58661, 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 2.28.0), 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. 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

## Impact An authenticated user can repeatedly upload files to the data-table upload endpoint, bypassing the per-request quota check, which does not account for files already written to the shared temporary directory. This causes temporary files to accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host. ## Patches Users should upgrade to the patched version once available to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Restrict n8n instance access to fully trusted users only. - Set `uploadMaxFileSize` to a low value to limit individual upload size. - Monitor and alert on disk usage in the n8n temporary upload directory. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

CVE-2026-58661 Affected n8n Versions

2 component(s)
Fixed Versions:
2.28.01.123.58
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
≥ 2.0.0
< 2.28.0
2.28.0
n8n
npm/n8n
npm
< 1.123.58
1.123.58

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-w867-jm58-p9pv
NVD — CVE-2026-58661 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-58661
n8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n
n8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.58
n8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0
www.vulncheck.com/advisories/n8n-disk... WEB
https://www.vulncheck.com/advisories/n8n-disk-space-exhaustion-via-data-table-file-upload-endpoint

Frequently Asked Questions

What is CVE-2026-58661?
CVE-2026-58661 is a security vulnerability in n8n involving Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads under CWE-770: Allocation of Resources Without Limits or Throttling.
Which n8n versions are affected?
Affected versions include releases prior to 2.28.0, 1.123.58 across affected packages: n8n.
What version fixes CVE-2026-58661?
Upgrading to 2.28.0, 1.123.58 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 2.28.0, 1.123.58. Upgrade your dependency to 2.28.0, 1.123.58 or later.
What CWE is associated with CVE-2026-58661?
CVE-2026-58661 is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check npm dependencies for CVE-2026-58661?
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-w867-jm58-p9pv",
  "modified" : "2026-07-22T22:25:45Z",
  "published" : "2026-07-22T22:25:45Z",
  "aliases" : [ "CVE-2026-58661" ],
  "summary" : "n8n: Authenticated Users Can Exhaust Temporary Disk Storage via Data-Table File Uploads",
  "details" : "## Impact\nAn authenticated user can repeatedly upload files to the data-table upload endpoint, bypassing the per-request quota check, which does not account for files already written to the shared temporary directory. This causes temporary files to accumulate on disk until the periodic cleanup runs, potentially exhausting available disk space on the host.\n\n## Patches\nUsers should upgrade to the patched version once available to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Restrict n8n instance access to fully trusted users only.\n- Set `uploadMaxFileSize` to a low value to limit individual upload size.\n- Monitor and alert on disk usage in the n8n temporary upload directory.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.28.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.123.58"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-w867-jm58-p9pv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-58661"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.58"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@2.28.0"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/n8n-disk-space-exhaustion-via-data-table-file-upload-endpoint"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-22T22:25:45Z",
    "nvd_published_at" : null
  }
}