GHSA-jwm3-qcfw-c5pp

Suggest an improvement
Source
https://github.com/advisories/GHSA-jwm3-qcfw-c5pp
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-jwm3-qcfw-c5pp/GHSA-jwm3-qcfw-c5pp.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-jwm3-qcfw-c5pp
Aliases
Downstream
Published
2026-06-16T22:39:46Z
Modified
2026-07-08T08:27:03Z
Severity
  • 5.0 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
Summary
n8n: Python Code Node AST Validator Bypass
Details

Impact

An authenticated user with permission to create or modify workflows containing a Python Code node could bypass the AST security validator and access the task executor module namespace. On self-hosted instances where N8N_BLOCK_RUNNER_ENV_ACCESS=false is set, this extended to disclosure of environment variables accessible to the task runner process.

This issue only affects instances where the Python Task Runner is enabled and N8N_BLOCK_RUNNER_ENV_ACCESS=true.

Patches

The issue has been fixed in n8n versions 2.25.7, and 2.26.2. 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.
  • Disable the Python Code node by adding n8n-nodes-base.code to the NODES_EXCLUDE environment variable, or disable the Python Task Runner entirely.

These workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.

Database specific 
{
    "cwe_ids": [
        "CWE-693"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-16T22:39:46Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
}
References

Affected packages

npm / n8n

Package

Name
n8n
View open source insights on deps.dev
Purl
pkg:npm/n8n

Affected ranges

Type
SEMVER
Events
Introduced
2.26.0
Fixed
2.26.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-jwm3-qcfw-c5pp/GHSA-jwm3-qcfw-c5pp.json"

npm / n8n

Package

Name
n8n
View open source insights on deps.dev
Purl
pkg:npm/n8n

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.25.7

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-jwm3-qcfw-c5pp/GHSA-jwm3-qcfw-c5pp.json"