diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 1ab927a6a26c..b20c11311144 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -6194,7 +6194,7 @@ public class DefaultCodegen implements CodegenConfig {
                 // skip as it implies `consumes` in OAS2 is not defined
                 continue;
             } else {
-                mediaType.put("mediaType", escapeText(escapeQuotationMark(key)));
+                mediaType.put("mediaType", escapeQuotationMark(key));
             }
             mediaTypeList.add(mediaType);
         }
@@ -6260,7 +6260,7 @@ public class DefaultCodegen implements CodegenConfig {
 
         for (String key : produces) {
             // escape quotation to avoid code injection, "*/*" is a special case, do nothing
-            String encodedKey = "*/*".equals(key) ? key : escapeText(escapeQuotationMark(key));
+            String encodedKey = "*/*".equals(key) ? key : escapeQuotationMark(key);
             //Only unique media types should be added to "produces"
             if (!existingMediaTypes.contains(encodedKey)) {
                 Map<String, String> mediaType = new HashMap<>();
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
index 22647ef5dd9d..59e2054df38b 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/java/spring/SpringCodegenTest.java
@@ -1403,4 +1403,33 @@ public class SpringCodegenTest {
             .assertMethod("putSomeMapItem")
             .bodyContainsLines("super.putSomeMapItem(key, someMapItem);");
     }
+
+    @Test
+    public void shouldHandleContentTypeWithSecondWildcardSubtype_issue12457() throws IOException {
+        File output = Files.createTempDirectory("test").toFile().getCanonicalFile();
+        output.deleteOnExit();
+
+        OpenAPI openAPI = new OpenAPIParser()
+            .readLocation("src/test/resources/bugs/issue_12457.yaml", null, new ParseOptions()).getOpenAPI();
+        SpringCodegen codegen = new SpringCodegen();
+        codegen.setLibrary(SPRING_BOOT);
+        codegen.setOutputDir(output.getAbsolutePath());
+        codegen.additionalProperties().put(SpringCodegen.USE_TAGS, "true");
+
+        ClientOptInput input = new ClientOptInput()
+            .openAPI(openAPI)
+            .config(codegen);
+
+        DefaultGenerator generator = new DefaultGenerator();
+        Map<String, File> files = generator.opts(input).generate().stream()
+            .collect(Collectors.toMap(File::getName, Function.identity()));
+
+        JavaFileAssert.assertThat(files.get("UsersApi.java"))
+            .assertMethod("wildcardSubTypeForContentType")
+            .assertMethodAnnotations()
+            .containsWithNameAndAttributes("RequestMapping", ImmutableMap.of(
+                "produces", "{ \"application/json\", \"application/*\" }",
+                "consumes", "{ \"application/octet-stream\", \"application/*\" }"
+            ));
+    }
 }
diff --git a/modules/openapi-generator/src/test/resources/bugs/issue_12457.yaml b/modules/openapi-generator/src/test/resources/bugs/issue_12457.yaml
new file mode 100644
index 000000000000..84d770898ee9
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/bugs/issue_12457.yaml
@@ -0,0 +1,33 @@
+openapi: 3.0.1
+info:
+  title: OpenAPI Petstore
+  description: "sample to vet integer handling"
+  version: 1.0.0
+tags: []
+paths:
+  /request:
+    get:
+      operationId: wildcardSubTypeForContentType
+      tags:
+      - users
+      requestBody:
+        description: The attachment
+        content:
+          application/octet-stream:
+            schema:
+              type: string
+              format: binary
+          application/*:
+            schema:
+              type: string
+              format: binary
+      responses:
+        '200':
+          description: response
+          content:
+            application/json:
+              schema:
+                type: string
+            application/*:
+              schema:
+                type: string
\ No newline at end of file