GHSA-9c38-2mcm-q7f7

Suggest an improvement
Source
https://github.com/advisories/GHSA-9c38-2mcm-q7f7
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-9c38-2mcm-q7f7/GHSA-9c38-2mcm-q7f7.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-9c38-2mcm-q7f7
Aliases
Downstream
Published
2026-06-16T19:01:16Z
Modified
2026-07-20T13:45:32Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
  • 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N CVSS Calculator
Summary
n8n: Merge Node SQL Mode Prototype Pollution
Details

Impact

An authenticated user with permission to create or modify workflows could pollute the sandbox used by the Merge node's SQL Query mode. Because the sandbox context was cached and reused across all workflow executions on the instance, prototype mutations introduced by one user's workflow persist into subsequent Merge SQL executions belonging to other users or projects. This allowed a low-privileged attacker to intercept workflow data processed by other users on the same instance.

This issue only affects multi-user n8n instances where more than one user has permission to create and execute workflows containing the Merge node in SQL Query mode.

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 Merge node by adding n8n-nodes-base.merge to the NODES_EXCLUDE environment variable.

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

Database specific 
{
    "cwe_ids": [
        "CWE-488"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-16T19:01:16Z",
    "nvd_published_at": "2026-06-23T16:17:02Z",
    "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-9c38-2mcm-q7f7/GHSA-9c38-2mcm-q7f7.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-9c38-2mcm-q7f7/GHSA-9c38-2mcm-q7f7.json"