Affected: Go: github.com/getkin/kin-openapi

### Summary

When validating a request with a multipart/form-data schema, if the OpenAPI schema allows it, an attacker can upload a crafted ZIP file (e.g., a ZIP bomb), causing the server to consume all available system memory.

### Details

The root cause comes from the [ZipFileBodyDecoder](https://github.com/getkin/kin-openapi/blob/6da871e0e170b7637eb568c265c08bc2b5d6e7a3/openapi3filter/req_resp_decoder.go#L1523), which is registered [automatically](https://github.com/getkin/kin-openapi/blob/6da871e0e170b7637eb568c265c08bc2b5d6e7a3/openapi3filter/req_resp_decoder.go#L1275) by the module (contrary to what the [documentation says](https://github.com/getkin/kin-openapi?tab=readme-ov-file#custom-content-type-for-body-of-http-requestresponse).

### PoC To reproduce the vulnerability, you can use the following OpenAPI schema: ```yaml openapi: 3.0.0 info: title: 'Validator' version: 0.0.1 paths: /: post: requestBody: required: true content: multipart/form-data: schema: type: object required: - file properties: file: type: string format: binary responses: '200': description: Created ``` And this code to validate the request (nothing fancy, it basically only calls the `openapi3filter.ValidateRequest` function`): ```go package main

import ( "fmt" "log" "net/http"

"github.com/getkin/kin-openap…