What’s Vulnerable › Vulnerabilities

CVE-2021-21429: Creation of Temporary File in Directory with Insecure Permissions in the OpenAPI Generator Maven plugin

• Severity: low (CVSS 3.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-04-27 · updated 2026-06-17
• Weakness: CWE-552

Description

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

• OpenAPITools openapi-generator: before 5.1.0 — fixed in 5.1.0

How to fix

Upgrade to a fixed version: OpenAPITools openapi-generator 5.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/OpenAPITools/openapi-generator/pull/8795
• https://github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mv
• https://github.com/OpenAPITools/openapi-generator/pull/8795
• https://github.com/OpenAPITools/openapi-generator/security/advisories/GHSA-867q-77cc-98mv

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