CVE-2026-27496: N8n N8n Has In-Process Memory Disclosure Vulnerability

HIGH
Advisory Identifier: GHSA-xvh5-5qg4-x9qp
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CVSS 6.5
CWE-908
Published
Advisory Summary

CVE-2026-27496 is a HIGH (CVSS 6.5) n8n has in-process memory disclosure vulnerability (CWE-908: Use of Uninitialized Resource) affecting N8n libraries in the npm ecosystem. The issue involves n8n has in-process memory disclosure in its task runner. Remediation is available by upgrading affected packages to version 1.123.22, 2.10.1, 2.9.3.

CVE-2026-27496 at a Glance

CVE Identifier CVE-2026-27496
GHSA Identifier GHSA-xvh5-5qg4-x9qp
Severity HIGH
CVSS v3.1 Base Score 6.5
CWE Classification CWE-908: Use of Uninitialized Resource
Affected Product N8n
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.5

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

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

How to Fix CVE-2026-27496

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: 2.10.1 
npm install n8n@2.10.1
n8n fixed: 2.9.3 
npm install n8n@2.9.3
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-2026-27496, 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-908: Use of Uninitialized Resource, where the product uses or accesses a resource that has not been initialized. 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 use the JavaScript Task Runner to allocate uninitialized memory buffers. Uninitialized buffers may contain residual data from the same Node.js process — including data from prior requests, tasks, secrets, or tokens — resulting in information disclosure of sensitive in-process data. - Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`. - In external runner mode, the impact is limited to data within the external runner process. ## Patches The issue has been fixed in n8n versions >= 1.123.22, >= 2.10.1 , and >= 2.9.3. Users should upgrade to this version 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 isolate the runner process. These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

CVE-2026-27496 Affected N8n Versions

3 component(s)
Fixed Versions:
1.123.222.10.12.9.3
Product / Package Ecosystem Affected Versions Fixed Version
n8n
npm/n8n
npm
< 1.123.22
1.123.22
n8n
npm/n8n
npm
≥ 2.10.0
< 2.10.1
2.10.1
n8n
npm/n8n
npm
≥ 2.0.0-rc.0
< 2.9.3
2.9.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp
NVD — CVE-2026-27496 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-27496
N8n Security Information SECURITY
https://docs.n8n.io/hosting/configuration/task-runners
N8n Security Information SECURITY
https://docs.n8n.io/hosting/securing/blocking-nodes
N8n Source Repository REPOSITORY
https://github.com/n8n-io/n8n

Frequently Asked Questions

What is CVE-2026-27496?
CVE-2026-27496 is a security vulnerability in N8n involving n8n has In-Process Memory Disclosure in its Task Runner under CWE-908: Use of Uninitialized Resource.
Which N8n versions are affected?
Affected versions include releases prior to 1.123.22, 2.10.1, 2.9.3 across affected packages: n8n.
What version fixes CVE-2026-27496?
Upgrading to 1.123.22, 2.10.1, 2.9.3 (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, 2.10.1, 2.9.3. Upgrade your dependency to 1.123.22, 2.10.1, 2.9.3 or later.
What is the CVSS score of CVE-2026-27496?
CVE-2026-27496 has a CVSS v3.1 base score of 6.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-27496?
CVE-2026-27496 is classified under CWE-908: Use of Uninitialized Resource (The product uses or accesses a resource that has not been initialized.).
How can I check npm dependencies for CVE-2026-27496?
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-xvh5-5qg4-x9qp",
  "modified" : "2026-03-27T22:08:05Z",
  "published" : "2026-03-25T17:00:25Z",
  "aliases" : [ "CVE-2026-27496" ],
  "summary" : "n8n has In-Process Memory Disclosure in its Task Runner",
  "details" : "## Impact\nAn authenticated user with permission to create or modify workflows could use the JavaScript Task Runner to allocate uninitialized memory buffers. Uninitialized buffers may contain residual data from the same Node.js process — including data from prior requests, tasks, secrets, or tokens — resulting in information disclosure of sensitive in-process data.\n- Task Runners must be enabled using `N8N_RUNNERS_ENABLED=true`.\n- In external runner mode, the impact is limited to data within the external runner process.\n\n## Patches\nThe issue has been fixed in n8n versions >= 1.123.22, >= 2.10.1 , and >= 2.9.3. Users should upgrade to this version 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 isolate the runner process.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "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" : "2.10.0"
      }, {
        "fixed" : "2.10.1"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "n8n"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0-rc.0"
      }, {
        "fixed" : "2.9.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/n8n-io/n8n/security/advisories/GHSA-xvh5-5qg4-x9qp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-27496"
  }, {
    "type" : "WEB",
    "url" : "https://docs.n8n.io/hosting/configuration/task-runners"
  }, {
    "type" : "WEB",
    "url" : "https://docs.n8n.io/hosting/securing/blocking-nodes"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/n8n-io/n8n"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-908" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-03-25T17:00:25Z",
    "nvd_published_at" : "2026-03-25T18:16:31Z"
  }
}