GHSA-hw8v-xxg5-vvvx

Suggest an improvement
Source
https://github.com/advisories/GHSA-hw8v-xxg5-vvvx
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hw8v-xxg5-vvvx/GHSA-hw8v-xxg5-vvvx.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-hw8v-xxg5-vvvx
Aliases
Downstream
Published
2026-09-10T15:11:07Z
Modified
2026-09-10T15:15:05Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N CVSS Calculator
Summary
n8n: Expression Sandbox Escape via Class-Field Sanitizer Rebinding Can Lead to Code Execution
Details

Impact

The expression compiler's sanitizer resolved through a dynamically-scoped this, so a class field named __sanitize rebound it and reached the Function constructor. On the backend, any expression author could run code in the n8n process; in the editor preview, a member's expression could run as JavaScript in the session of whoever opened the workflow. The patch rejects reserved class-member names.

Patches

The issue has been fixed in n8n versions 1.123.76, 2.37.7, and 2.38.2. 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:

  • Restrict n8n instance access to fully trusted users only.
  • Avoid granting workflow-create or workflow-edit permissions to untrusted users.
  • Audit existing workflows for unexpected or unfamiliar expressions in node parameters.
  • Set N8N_EXPRESSION_ENGINE=vm.

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

Database specific 
{
    "cwe_ids":  [
        "CWE-94"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-10T15:11:07Z",
    "nvd_published_at":  "2026-09-08T22:19:16Z",
    "severity":  "HIGH"
}
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
0 Unknown introduced version / All previous versions are affected
Fixed
1.123.76

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hw8v-xxg5-vvvx/GHSA-hw8v-xxg5-vvvx.json"

npm / n8n

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
2.38.0
Fixed
2.38.2

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hw8v-xxg5-vvvx/GHSA-hw8v-xxg5-vvvx.json"

npm / n8n

Package

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

Affected ranges

Type
SEMVER
Events
Introduced
2.0.0
Fixed
2.37.7

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-hw8v-xxg5-vvvx/GHSA-hw8v-xxg5-vvvx.json"