CVE-2021-21429: Openapi-Generator Openapi Generator

Low severity, CVSS 3.3. EPSS: 0.3% chance of exploitation in the next 30 days.

OpenAPI Generator allows generation of API client libraries, server stubs, documentation and configuration automatically given an OpenAPI Spec. Using `File.createTempFile` in JDK will result in creating and using insecure temporary files that can leave application and system data vulnerable to attacks. OpenAPI Generator maven plug-in creates insecure temporary files during the process. The issue has been patched with `Files.createTempFile` and released in the v5.1.0 stable version.

Affected products

• Openapi-Generator Openapi Generator: before 5.1.0 (fixed in 5.1.0)

Published 2021-04-27. Last modified 2026-06-17.