Comprehensive Technical Analysis of EUVD-2026-8759
1. Vulnerability Assessment and Severity Evaluation
The vulnerability EUVD-2026-8759 pertains to a potential Remote Code Execution (RCE) in the n8n workflow automation tool via the Merge Node. The CVSS (Common Vulnerability Scoring System) base score of 9.4 indicates a critical severity level. The CVSS vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H breaks down as follows:
- AV:N - Attack Vector: Network
- AC:L - Attack Complexity: Low
- AT:N - Attack Technique: Network
- PR:L - Privileges Required: Low
- UI:N - User Interaction: None
- VC:H - Vulnerability Characteristics: High
- VI:H - Vulnerability Impact: High
- VA:H - Vulnerability Availability: High
- SC:H - Scope Change: High
- SI:H - Scope Impact: High
- SA:H - Scope Availability: High
This high score underscores the critical nature of the vulnerability, indicating that it can be exploited remotely with low complexity and without user interaction, leading to significant impact on confidentiality, integrity, and availability.
2. Potential Attack Vectors and Exploitation Methods
The primary attack vector is through the network, specifically targeting the Merge Node functionality in n8n. An attacker could exploit this vulnerability by crafting malicious input that is processed by the Merge Node, leading to the execution of arbitrary code on the server. Given the low complexity and lack of user interaction required, this vulnerability is highly exploitable.
Potential exploitation methods include:
- Malicious Input Injection: An attacker could inject specially crafted data into the Merge Node, which is then processed and executed by the server.
- Network-Based Attacks: Since the attack vector is network-based, an attacker could exploit this vulnerability over the internet, making it a significant risk for publicly accessible n8n instances.
3. Affected Systems and Software Versions
The vulnerability affects the following versions of n8n:
- Versions 2.0.0 to 2.9.2
- Versions below 1.123.22
- Versions 2.10.0 to 2.10.0
Users running any of these versions are at risk and should take immediate action to mitigate the vulnerability.
4. Recommended Mitigation Strategies
To mitigate the risk associated with this vulnerability, the following actions are recommended:
- Update to the Latest Version: Upgrade to n8n version 2.9.3, 1.123.22, or 2.10.1, which contain the necessary patches to address this vulnerability.
- Network Segmentation: Implement network segmentation to limit the exposure of n8n instances to the internet.
- Input Validation: Ensure that all inputs to the Merge Node are properly validated and sanitized to prevent malicious code execution.
- Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities or attempts to exploit this vulnerability.
5. Impact on European Cybersecurity Landscape
The impact of this vulnerability on the European cybersecurity landscape is significant, given the widespread use of n8n for workflow automation. Organizations relying on n8n for critical business processes are at risk of data breaches, service disruptions, and potential financial losses. The high severity score and ease of exploitation make it a prime target for cybercriminals, potentially leading to widespread attacks across Europe.
6. Technical Details for Security Professionals
For security professionals, the following technical details are pertinent:
- Vulnerability Identification: The vulnerability is identified by EUVD-2026-8759, CVE-2026-27497, and GHSA-wxx7-mcgf-j869.
- References: Detailed information and patches can be found in the following GitHub links:
- Assigner: The vulnerability was assigned by GitHub_M.
- ENISA IDs: The ENISA IDs for the affected products and vendor are:
- Product IDs: 4bdadb9b-2828-39a9-82f4-09ff91352bcd, 5bcf453e-ddb1-3233-9cd7-b292e4d6a22e, d7219794-502f-3a13-abc8-dcc213dcb1cc
- Vendor ID: c6fd74c9-aa0d-3b85-a2c5-5f05da88df48
In conclusion, the vulnerability EUVD-2026-8759 represents a critical risk to organizations using n8n. Immediate action is required to update to the patched versions and implement additional security measures to mitigate the risk of exploitation.