CVE-2026-56349
Received Received - Intake

Input Validation Bypass in n8n Guardrail Node

Publication date: 2026-07-15

Last updated on: 2026-07-15

Assigner: VulnCheck

Description
n8n before version 2.10.0 contains an input validation vulnerability in the Guardrail node that allows attackers to bypass default guardrail instructions. End users can craft malicious inputs to circumvent guardrail protections and compromise workflow integrity.

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Meta Information

Published
2026-07-15
Last Modified
2026-07-15
Generated
2026-07-15
AI Q&A
2026-07-15
EPSS Evaluated
N/A
NVD
CVE-2026-56349
EUVD
EUVD-2026-44624

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
n8n n8n to 2.10.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

AI Quick Actions

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Detection Guidance

To detect this vulnerability, check the version of n8n installed on your system. If it is below 2.10.0, the system is vulnerable. Use commands like 'n8n --version' or check package managers (e.g., 'npm list n8n' or 'apt list --installed | grep n8n').

Review workflows using the Guardrail node for unusual inputs or bypass attempts. Monitor logs for suspicious activity related to input validation failures.

Impact Analysis

This vulnerability allows attackers to manipulate workflows by bypassing guardrail protections. This could lead to unauthorized actions, data corruption, or workflow disruption if exploited. Users should upgrade to version 2.10.0 or later to mitigate risks.

Executive Summary

CVE-2026-56349 is an input validation flaw in n8n versions before 2.10.0 affecting the Guardrail node. Attackers can craft malicious inputs to bypass default guardrail instructions, compromising workflow integrity by circumventing security protections.

Mitigation Strategies

Upgrade n8n to version 2.10.0 or later immediately. This is the primary mitigation. If upgrading is not possible, restrict access to trusted users only and review workflows for guardrail bypasses.

Executive Summary

CVE-2026-56349 is an input validation flaw in n8n versions before 2.10.0 affecting the Guardrail node. Attackers can craft malicious inputs to bypass default guardrail instructions, compromising workflow integrity.

Impact Analysis

This vulnerability allows attackers to bypass security controls in n8n workflows, potentially leading to unauthorized actions or data manipulation. Users of affected versions risk workflow integrity and security breaches.

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