diff --git a/src/servala/core/crd.py b/src/servala/core/crd.py
index e1ca8d2..42ca351 100644
--- a/src/servala/core/crd.py
+++ b/src/servala/core/crd.py
@@ -5,6 +5,7 @@ from django.core.validators import MaxValueValidator, MinValueValidator, RegexVa
 from django.db import models
 from django.forms.models import ModelForm, ModelFormMetaclass
 from django.utils.translation import gettext_lazy as _
+from jsonschema import validate
 
 from servala.core.models import ServiceInstance
 
@@ -39,6 +40,9 @@ def generate_django_model(schema, group, version, kind):
     spec["properties"].pop("resourceRef", None)
     model_fields.update(build_object_fields(spec, "spec", parent_required=True))
 
+    # Store the original schema on the model class
+    model_fields["SCHEMA"] = schema
+
     meta_class = type("Meta", (), {"app_label": "crd_models"})
     model_fields["Meta"] = meta_class
 
@@ -138,6 +142,7 @@ def get_django_field(
 class CrdModelFormMixin:
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
+        self.schema = self._meta.model.SCHEMA
 
         for field in ("organization", "context"):
             self.fields[field].widget = forms.HiddenInput()
@@ -170,10 +175,18 @@ class CrdModelFormMixin:
 
     def clean(self):
         cleaned_data = super().clean()
-        # TODO implement custom validation logic
-        # nested_data = self.get_nested_data()
+        self.validate_nested_data(
+            self.get_nested_data().get("spec", {}), self.schema["properties"]["spec"]
+        )
         return cleaned_data
 
+    def validate_nested_data(self, data, schema):
+        """Validate data against the provided OpenAPI v3 schema"""
+        try:
+            validate(instance=data, schema=schema)
+        except Exception as e:
+            raise forms.ValidationError(f"Validation error: {e.message}")
+
 
 def generate_model_form_class(model):
     meta_attrs = {