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CVE-2026-42231

n8n: Prototype Pollution in XML Webhook Body Parser Leads to RCE

Published: May 4, 2026Updated: May 6, 2026 Sources: CVE List NVD BDUCWE-1321
NVD MITRE
8.8CVSSHIGH
EPSS Score
0.9%
Top 46.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

n8n is an open source workflow automation platform. Prior to versions 1.123.32, 2.17.4, and 2.18.1, 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. This issue has been patched in versions 1.123.32, 2.17.4, and 2.18.1.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-1321

Affected Products

n8nn8n-io
Mixed
Cloud & SaaS / saas-application
n8nn8n
Mixed
Cloud & SaaS / saas-application
N8nСообщество свободного программного обеспечения
On-premLibrary
OSS Libraries / generic-library
n8n-iocommercialDECloud & SaaSaka n8n
n8noss-projectCloud & SaaS
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/n8n-io/n8n/security/advisories/GHSA-q5f4-99jv-pgg5
github.com

Timeline

Published
May 4, 2026
Last Updated
May 6, 2026

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