CVE-2026-27495: N8n N8n Has A Sandbox Escape Vulnerability

CRITICAL
Advisory Identifier: GHSA-jjpj-p2wh-qf23
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CWE-94
Published
Advisory Summary

CVE-2026-27495 is a CRITICAL n8n has a sandbox escape vulnerability (CWE-94: Improper Control of Generation of Code ('Code Injection')) affecting N8n libraries in the npm ecosystem. The issue involves n8n has a sandbox escape in its javascript task runner. Remediation is available by upgrading affected packages to version 1.123.22, 2.9.3, 2.10.1.

CVE-2026-27495 at a Glance

CVE Identifier CVE-2026-27495
GHSA Identifier GHSA-jjpj-p2wh-qf23
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-94: Improper Control of Generation of Code ('Code Injection')
Affected Product N8n
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-27495

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: 1.123.22 
npm install n8n@1.123.22
n8n fixed: 2.9.3 
npm install n8n@2.9.3
n8n fixed: 2.10.1 
npm install n8n@2.10.1
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-2026-27495, 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 1.123.22), 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-94: Improper Control of Generation of Code ('Code Injection'), where the product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. 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 with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary. On instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner. - Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. ## Patches The issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability. ## Workarounds If upgrading is not immediately possible, administrators should consider the following temporary mitigations: - Limit workflow creation and editing permissions to fully trusted users only. - Use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures. ## Resources - [n8n Documentation — Task Runners](https://docs.n8n.io/hosting/configuration/task-runners/)

CVE-2026-27495 Affected N8n Versions

3 component(s)
Fixed Versions:
1.123.222.9.32.10.1
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 1.123.22
1.123.22
n8n
npm/n8n
npm
≥ 2.0.0
< 2.9.3
2.9.3
n8n
npm/n8n
npm
≥ 2.10.0
< 2.10.1
2.10.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-jjpj-p2wh-qf23
NVD — CVE-2026-27495 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27495
N8n Security Information SECURITY
https://docs.n8n.io/hosting/configuration/task-runners
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n
N8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22
N8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1
N8n Release RELEASE
https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3

Frequently Asked Questions

What is CVE-2026-27495?
CVE-2026-27495 is a security vulnerability in N8n involving n8n has a Sandbox Escape in its JavaScript Task Runner under CWE-94: Improper Control of Generation of Code ('Code Injection').
Which N8n versions are affected?
Affected versions include releases prior to 1.123.22, 2.9.3, 2.10.1 across affected packages: n8n.
What version fixes CVE-2026-27495?
Upgrading to 1.123.22, 2.9.3, 2.10.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is n8n affected?
Yes, n8n is affected in releases prior to 1.123.22, 2.9.3, 2.10.1. Upgrade your dependency to 1.123.22, 2.9.3, 2.10.1 or later.
What CWE is associated with CVE-2026-27495?
CVE-2026-27495 is classified under CWE-94: Improper Control of Generation of Code ('Code Injection') (The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.).
How can I check npm dependencies for CVE-2026-27495?
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-jjpj-p2wh-qf23",
  "modified" : "2026-02-27T21:51:21Z",
  "published" : "2026-02-25T21:23:15Z",
  "aliases" : [ "CVE-2026-27495" ],
  "summary" : "n8n has a Sandbox Escape in its JavaScript Task Runner",
  "details" : "## Impact\nAn authenticated user with permission to create or modify workflows could exploit a vulnerability in the JavaScript Task Runner sandbox to execute arbitrary code outside the sandbox boundary.\n\nOn instances using internal Task Runners (default runner mode), this could result in full compromise of the n8n host. On instances using external Task Runners, the attacker might gain access to or impact other task executed on the Task Runner.\n- Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`.\n\n## Patches\nThe issue has been fixed in n8n versions 2.10.1, 2.9.3, and 1.123.22. Users should upgrade to one of these versions or later to remediate the vulnerability.\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Limit workflow creation and editing permissions to fully trusted users only.\n- Use external runner mode (`N8N_RUNNERS_MODE=external`) to limit the blast radius.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.\n\n## Resources\n- [n8n Documentation — Task Runners](https://docs.n8n.io/hosting/configuration/task-runners/)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.123.22"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.9.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.10.0"
      }, {
        "fixed" : "2.10.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-jjpj-p2wh-qf23"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27495"
  }, {
    "type" : "WEB",
    "url" : "https://docs.n8n.io/hosting/configuration/task-runners"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@1.123.22"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@2.10.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/releases/tag/n8n@2.9.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-25T21:23:15Z",
    "nvd_published_at" : "2026-02-25T23:16:20Z"
  }
}