CVE-2026-23947

Comprehensive Technical Analysis of CVE-2026-23947

1. Vulnerability Assessment and Severity Evaluation

CVE ID: CVE-2026-23947

Description: Orval, a tool that generates type-safe JavaScript (TypeScript) clients from OpenAPI v3 or Swagger v2 specifications, is vulnerable to arbitrary code execution. Versions prior to 7.19.0 and up to 8.0.2 are affected. The vulnerability arises from improper handling of the x-enumDescriptions field during the generation of const enum in TypeScript, allowing untrusted OpenAPI specifications to inject executable code.

CVSS Score: 9.8

Severity Evaluation: The CVSS score of 9.8 indicates a critical vulnerability. This high score is due to the potential for arbitrary code execution, which can lead to complete system compromise. The vulnerability can be exploited remotely, making it particularly dangerous.

2. Potential Attack Vectors and Exploitation Methods

Attack Vectors:

• Untrusted OpenAPI Specifications: An attacker can craft a malicious OpenAPI specification that includes harmful code in the x-enumDescriptions field.
• Supply Chain Attacks: If an organization relies on third-party OpenAPI specifications, an attacker could compromise these specifications to inject malicious code.

Exploitation Methods:

• Code Injection: By embedding malicious TypeScript/JavaScript code within the x-enumDescriptions field, an attacker can ensure that this code is executed when the client is generated.
• Remote Code Execution (RCE): The injected code can perform various malicious actions, such as data exfiltration, system compromise, or further propagation of malware.

3. Affected Systems and Software Versions

Affected Versions:

• Orval versions prior to 7.19.0
• Orval versions from 7.19.0 to 8.0.2

Affected Systems:

• Any environment that consumes generated TypeScript clients from Orval using the affected versions.
• Systems that automatically process and integrate OpenAPI specifications without proper validation.

4. Recommended Mitigation Strategies

Immediate Actions:

• Upgrade Orval: Ensure that all instances of Orval are upgraded to version 7.19.0 or 8.0.2, which contain the fix for this vulnerability.
• Validate Inputs: Implement strict validation and sanitization of OpenAPI specifications before they are processed by Orval.

Long-Term Strategies:

• Code Review: Conduct thorough code reviews and security audits of tools and libraries that process external specifications.
• Security Training: Educate developers and security teams about the risks associated with code injection vulnerabilities.
• Monitoring: Implement continuous monitoring and logging to detect any unusual activities that may indicate an exploitation attempt.

5. Impact on Cybersecurity Landscape

Broader Implications:

• Supply Chain Security: This vulnerability highlights the importance of securing the software supply chain, especially when relying on third-party specifications and tools.
• Code Generation Tools: It underscores the need for robust security measures in code generation tools, which are increasingly used in modern development pipelines.
• OpenAPI Ecosystem: The OpenAPI ecosystem must adopt stricter security practices to prevent similar vulnerabilities in the future.

6. Technical Details for Security Professionals

Vulnerability Details:

• Code Path: The vulnerability affects the getEnumImplementation() function in @orval/core, which processes the x-enumDescriptions field without proper escaping.
• Injection Point: The injection occurs during the generation of const enum in TypeScript, resulting in executable code within the generated schema files.

Detection and Response:

• Static Analysis: Use static analysis tools to detect and flag any suspicious code patterns in generated TypeScript files.
• Dynamic Analysis: Implement runtime monitoring to detect and alert on any unexpected code execution.
• Incident Response: Develop an incident response plan that includes steps for identifying, containing, and remediating any exploitation of this vulnerability.

References:

• Orval v8.0.2 Release Notes
• GitHub Security Advisory

By addressing this vulnerability promptly and implementing robust security measures, organizations can mitigate the risks associated with CVE-2026-23947 and enhance their overall cybersecurity posture.