GHSA-q5f4-99jv-pgg5

Source

https://github.com/advisories/GHSA-q5f4-99jv-pgg5

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5f4-99jv-pgg5/GHSA-q5f4-99jv-pgg5.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-q5f4-99jv-pgg5

Aliases

CVE-2026-42231

Published

2026-04-29T21:25:02Z

Modified

2026-05-08T01:51:03.312026Z

Severity

10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
10.0 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H CVSS Calculator

Summary

n8n has Prototype Pollution in XML Webhook Body Parser that Leads to RCE

Details

Impact

A flaw in the xml2js library used to parse XML request bodies in n8n's webhook handler allowed prototype pollution via a crafted XML payload. An authenticated user with permission to create or modify workflows could exploit this to pollute the JavaScript object prototype and, by chaining the pollution with the Git node's SSH operations, achieve remote code execution on the n8n host.

Patches

The issue has been fixed in n8n versions 1.123.32, 2.17.4, and 2.18.1. 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.

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

n8n has adopted CVSS 4.0 as primary score for all security advisories. CVSS 3.1 vector strings are provided for backwards compatibility.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Database specific

{
    "github_reviewed_at": "2026-04-29T21:25:02Z",
    "nvd_published_at": "2026-05-04T19:16:05Z",
    "cwe_ids": [
        "CWE-1321"
    ],
    "severity": "CRITICAL",
    "github_reviewed": true
}

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

0Unknown introduced version / All previous versions are affected

Fixed

1.123.32

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5f4-99jv-pgg5/GHSA-q5f4-99jv-pgg5.json"

npm / n8n

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

2.18.0

Fixed

2.18.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5f4-99jv-pgg5/GHSA-q5f4-99jv-pgg5.json"

npm / n8n

Package

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

Affected ranges

Type: SEMVER
Events: Introduced

2.17.0

Fixed

2.17.4

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q5f4-99jv-pgg5/GHSA-q5f4-99jv-pgg5.json"