diff --git a/api/core/v1alpha1/clustercatalog_types.go b/api/core/v1alpha1/clustercatalog_types.go
index 595c4280..df38ec6a 100644
--- a/api/core/v1alpha1/clustercatalog_types.go
+++ b/api/core/v1alpha1/clustercatalog_types.go
@@ -311,8 +311,11 @@ type ResolvedImageSource struct {
 // Check for the existence of either a digest or tag reference at the end of the image reference
 // +kubebuilder:validation:XValidation:rule="self.ref.find('(@.*:)') != \"\" || self.ref.find(':.*$') != \"\"",message="ref is invalid, must end with a digest or a tag"
 //
-// If we don't find a digest in the reference, attempt to find the tag. Check if the tag is valid
-// +kubebuilder:validation:XValidation:rule="self.ref.find('(@.*:)') == \"\" ? (self.ref.find(':.*$') != \"\" ? self.ref.find(':.*$').matches(':[\\\\w][\\\\w.-]{0,127}$') : true) : true",message="ref is invalid, tag is invalid"
+// If we don't find a digest in the reference, attempt to find the tag. Check that the tag is less than 127 characters
+// +kubebuilder:validation:XValidation:rule="self.ref.find('(@.*:)') == \"\" ? (self.ref.find(':.*$') != \"\" ? self.ref.find(':.*$').substring(1).size() <= 127 : true) : true",message="ref is invalid, tag is invalid. the tag must not be more than 127 characters"
+//
+// If we don't find a digest in the reference, attempt to find the tag. Check that the tag is valid (word characters)
+// +kubebuilder:validation:XValidation:rule="self.ref.find('(@.*:)') == \"\" ? (self.ref.find(':.*$') != \"\" ? self.ref.find(':.*$').matches(':[\\\\w][\\\\w.-]*$') : true) : true",message="ref is invalid, tag is invalid. tag-based references must begin with a word character (alphanumeric + \"_\") followed by word characters or \".\", and \"-\" characters"
 //
 // If we find a digest in the reference, check that the digest algorithm is valid
 // +kubebuilder:validation:XValidation:rule="self.ref.find('(@.*:)') != \"\" ? self.ref.find('(@.*:)').matches('(@[A-Za-z][A-Za-z0-9]*([-_+.][A-Za-z][A-Za-z0-9]*)*[:])') : true",message="ref is invalid, digest algorithm is not valid. the algorithm must start with an uppercase or lowercase alpha character followed by alphanumeric characters and may contain the \"-\", \"_\", \"+\", and \".\" characters."
diff --git a/api/core/v1alpha1/clustercatalog_types_test.go b/api/core/v1alpha1/clustercatalog_types_test.go
index c24927f4..903e2aa5 100644
--- a/api/core/v1alpha1/clustercatalog_types_test.go
+++ b/api/core/v1alpha1/clustercatalog_types_test.go
@@ -98,7 +98,7 @@ func TestImageSourceCELValidationRules(t *testing.T) {
 				Ref: fmt.Sprintf("docker.io/foo/bar:%s", strings.Repeat("x", 200)),
 			},
 			wantErrs: []string{
-				"openAPIV3Schema.properties.spec.properties.source.properties.image: Invalid value: \"object\": ref is invalid, tag is invalid",
+				"openAPIV3Schema.properties.spec.properties.source.properties.image: Invalid value: \"object\": ref is invalid, tag is invalid. the tag must not be more than 127 characters",
 			},
 		},
 		"invalid tag based image ref, tag contains invalid characters": {
@@ -106,7 +106,7 @@ func TestImageSourceCELValidationRules(t *testing.T) {
 				Ref: "docker.io/foo/bar:-foo_bar-",
 			},
 			wantErrs: []string{
-				"openAPIV3Schema.properties.spec.properties.source.properties.image: Invalid value: \"object\": ref is invalid, tag is invalid",
+				"openAPIV3Schema.properties.spec.properties.source.properties.image: Invalid value: \"object\": ref is invalid, tag is invalid. tag-based references must begin with a word character (alphanumeric + \"_\") followed by word characters or \".\", and \"-\" characters",
 			},
 		},
 		"valid tag based image ref": {
@@ -130,6 +130,18 @@ func TestImageSourceCELValidationRules(t *testing.T) {
 				"openAPIV3Schema.properties.spec.properties.source.properties.image: Invalid value: \"object\": ref is invalid, a valid name is required",
 			},
 		},
+		"valid image ref, domain with port": {
+			spec: ImageSource{
+				Ref: "my-subdomain.docker.io:8080/foo/bar:latest",
+			},
+			wantErrs: []string{},
+		},
+		"valid image ref, tag ends with hyphen": {
+			spec: ImageSource{
+				Ref: "my-subdomain.docker.io:8080/foo/bar:latest-",
+			},
+			wantErrs: []string{},
+		},
 	} {
 		t.Run(name, func(t *testing.T) {
 			obj, err := runtime.DefaultUnstructuredConverter.ToUnstructured(&tc.spec) //nolint:gosec
diff --git a/config/base/crd/bases/olm.operatorframework.io_clustercatalogs.yaml b/config/base/crd/bases/olm.operatorframework.io_clustercatalogs.yaml
index aa71fc7d..f37c1c5e 100644
--- a/config/base/crd/bases/olm.operatorframework.io_clustercatalogs.yaml
+++ b/config/base/crd/bases/olm.operatorframework.io_clustercatalogs.yaml
@@ -187,9 +187,16 @@ spec:
                     - message: ref is invalid, must end with a digest or a tag
                       rule: self.ref.find('(@.*:)') != "" || self.ref.find(':.*$')
                         != ""
-                    - message: ref is invalid, tag is invalid
+                    - message: ref is invalid, tag is invalid. the tag must not be
+                        more than 127 characters
                       rule: 'self.ref.find(''(@.*:)'') == "" ? (self.ref.find('':.*$'')
-                        != "" ? self.ref.find('':.*$'').matches('':[\\w][\\w.-]{0,127}$'')
+                        != "" ? self.ref.find('':.*$'').substring(1).size() <= 127
+                        : true) : true'
+                    - message: ref is invalid, tag is invalid. tag-based references
+                        must begin with a word character (alphanumeric + "_") followed
+                        by word characters or ".", and "-" characters
+                      rule: 'self.ref.find(''(@.*:)'') == "" ? (self.ref.find('':.*$'')
+                        != "" ? self.ref.find('':.*$'').matches('':[\\w][\\w.-]*$'')
                         : true) : true'
                     - message: ref is invalid, digest algorithm is not valid. the
                         algorithm must start with an uppercase or lowercase alpha