Improper Handling of Highly Compressed Data (Data Amplification)

Summary

The kin-openapi is a Go project for handling OpenAPI files. In github.com/getkin/kin-openapi package versions prior to 0.131.0, when validating a request with a "multipart/form-data" schema, if the OpenAPI schema allows it, an attacker could upload a crafted ZIP file (e.g., a ZIP bomb), causing the server to consume all available system memory. The root cause of this issue comes from the "ZipFileBodyDecoder", which is registered automatically by the module (contrary to what the documentation states).