EUVD-2026-0036

Comprehensive Technical Analysis of EUVD-2026-0036

1. Vulnerability Assessment and Severity Evaluation

Vulnerability Description: The vulnerability in question is a Path Traversal issue in the AdonisJS web framework, specifically within its multipart file handling mechanism. This flaw allows a remote attacker to write arbitrary files to arbitrary locations on the server filesystem, potentially leading to unauthorized access, data corruption, or system compromise.

Severity Evaluation: The vulnerability has a CVSS Base Score of 9.2, which is considered critical. The CVSS vector string CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N indicates the following:

• Attack Vector (AV): Network (N) - The vulnerability is exploitable over the network.
• Attack Complexity (AC): Low (L) - The attack requires minimal complexity.
• Authentication (AT): Physical (P) - The attacker requires physical access to the system.
• Privileges Required (PR): None (N) - No privileges are required to exploit the vulnerability.
• User Interaction (UI): None (N) - No user interaction is required.
• Confidentiality Impact (VC): High (H) - The vulnerability has a high impact on confidentiality.
• Integrity Impact (VI): High (H) - The vulnerability has a high impact on integrity.
• Availability Impact (VA): High (H) - The vulnerability has a high impact on availability.
• Scope Change (SC): None (N) - The vulnerability does not change the security scope.
• Scope Impact (SI): None (N) - The vulnerability does not impact the security scope.
• Scope Availability (SA): None (N) - The vulnerability does not impact the availability scope.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Remote Exploitation: An attacker can exploit this vulnerability over the network by sending specially crafted multipart file upload requests.
• File Overwrite: The attacker can overwrite critical system files, configuration files, or application files, leading to system instability or unauthorized access.
• Arbitrary File Creation: The attacker can create new files in sensitive directories, potentially leading to code execution or data exfiltration.

Exploitation Methods:

• Crafted Requests: The attacker can craft HTTP requests with malicious file paths to traverse the directory structure and write files to unintended locations.
• Automated Tools: Exploitation can be automated using scripts or tools designed to exploit path traversal vulnerabilities.

3. Affected Systems and Software Versions

Affected Versions:

• @adonisjs/bodyparser through version 10.1.1
• 11.x prerelease versions prior to 11.0.0-next.6

Patched Versions:

• @adonisjs/bodyparser versions 10.1.2 and 11.0.0-next.6

4. Recommended Mitigation Strategies

Immediate Actions:

• Update Software: Upgrade to the patched versions of @adonisjs/bodyparser (10.1.2 or 11.0.0-next.6).
• Input Validation: Implement strict input validation and sanitization for file uploads to prevent path traversal attacks.
• Access Controls: Enforce strict access controls and permissions on the server filesystem to limit the impact of potential file writes.

Long-Term Strategies:

• Regular Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
• Security Training: Provide security training for developers to understand and prevent common vulnerabilities like path traversal.
• Monitoring: Implement monitoring and alerting systems to detect and respond to suspicious file upload activities.

5. Impact on European Cybersecurity Landscape

Regulatory Compliance:

• GDPR: Organizations handling personal data must ensure that such vulnerabilities are promptly addressed to comply with GDPR requirements.
• NIS Directive: Critical infrastructure providers must adhere to the Network and Information Systems (NIS) Directive, ensuring robust cybersecurity measures are in place.

Industry Impact:

• Web Applications: Web applications using AdonisJS are at risk, particularly those handling sensitive data or critical operations.
• Supply Chain: Vulnerabilities in widely-used frameworks can have a ripple effect, impacting multiple organizations and industries.

6. Technical Details for Security Professionals

Vulnerability Details:

• CVE ID: CVE-2026-21440
• GHSA ID: GHSA-gvq6-hvvp-h34h
• Assigner: GitHub_M

References:

• AdonisJS Core Security Advisory
• Bodyparser Commit 143a16f35602be8561215611582211dec280cae6
• Bodyparser Commit 6795c0e3fa824ae275bbd992aae60609e96f0f03
• Bodyparser Release v10.1.2
• Bodyparser Release v11.0.0-next.6
• AdonisJS Core Repository

ENISA IDs:

• Product IDs:
  • 22557ba2-af5f-3319-9734-3e8722fa4d42 (core, versions 11.0.0-next.0, < 11.0.0-next.6)
  • d2b5a695-8de9-3e93-bd1a-57c049b93e0d (core, versions < 10.1.2)
• Vendor ID: 51b8d8c6-ca07-337e-93b5-501f7bbd3f27 (adonisjs)

Conclusion: This Path Traversal vulnerability in AdonisJS is critical and requires immediate attention. Organizations using the affected versions should prioritize updating to the patched versions and implement additional security measures to mitigate the risk. Regular monitoring and security audits are essential to maintain a robust cybersecurity posture.