diff --git a/src/controller/artifact/processor/default.go b/src/controller/artifact/processor/default.go
index e8fea66f2..c10fa606f 100644
--- a/src/controller/artifact/processor/default.go
+++ b/src/controller/artifact/processor/default.go
@@ -101,7 +101,12 @@ func (d *defaultProcessor) AbstractMetadata(ctx context.Context, artifact *artif
 	if err := json.Unmarshal(manifest, mani); err != nil {
 		return err
 	}
-	// get config layer
+	// if manifest.Config.Mediatype not comply with stanard config json regex (unknown type),
+	// regex will filter either none-json format config or empty config
+	if d.GetArtifactType(ctx, artifact) == ArtifactTypeUnknown {
+		return nil
+	}
+	// else get config layer
 	_, blob, err := d.regCli.PullBlob(artifact.RepositoryName, mani.Config.Digest.String())
 	if err != nil {
 		return err
@@ -109,11 +114,8 @@ func (d *defaultProcessor) AbstractMetadata(ctx context.Context, artifact *artif
 	defer blob.Close()
 	// parse metadata from config layer
 	metadata := map[string]interface{}{}
-	// Some artifact may not have empty config layer.
-	if mani.Config.Size != 0 {
-		if err := json.NewDecoder(blob).Decode(&metadata); err != nil {
-			return err
-		}
+	if err = json.NewDecoder(blob).Decode(&metadata); err != nil {
+		return err
 	}
 	// Populate all metadata into the ExtraAttrs first.
 	artifact.ExtraAttrs = metadata
diff --git a/src/controller/artifact/processor/default_test.go b/src/controller/artifact/processor/default_test.go
index 9ba55a1fc..bdc04d54e 100644
--- a/src/controller/artifact/processor/default_test.go
+++ b/src/controller/artifact/processor/default_test.go
@@ -116,6 +116,31 @@ var (
         }
     ]
 }`
+	v2ManifestWithUnknownConfig = `{
+    "schemaVersion": 2,
+    "mediaType": "application/vnd.oci.image.manifest.v1+json",
+    "config": {
+        "mediaType": "application/vnd.nhl.peanut.butter.bagel",
+        "digest": "sha256:ee29d2e91da0e5dbf6536f5b369148a83ef59b0ce96e49da65dd6c25eb1fa44f",
+        "size": 33,
+        "newUnspecifiedField": null
+    },
+    "layers": [
+        {
+            "mediaType": "application/vnd.oci.empty.v1+json",
+            "digest": "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
+            "size": 2,
+            "newUnspecifiedField": "null"
+        }
+    ],
+    "subject": {
+        "mediaType": "application/vnd.oci.image.manifest.v1+json",
+        "digest": "sha256:5a01bbc4ce6f52541cbc7e6af4b22bb107991a4bdd433103ff65aeb00756e906",
+        "size": 714,
+        "newUnspecifiedField": null
+    }
+ }`
+	unknownConfig = `{NHL Peanut Butter on my NHL bagel}`
 )
 
 type defaultProcessorTestSuite struct {
@@ -146,6 +171,18 @@ func (d *defaultProcessorTestSuite) TestGetArtifactType() {
 	typee = processor.GetArtifactType(nil, art)
 	d.Equal(ArtifactTypeUnknown, typee)
 
+	mediaType = "application/vnd.oci.empty.v1+json"
+	art = &artifact.Artifact{MediaType: mediaType}
+	processor = &defaultProcessor{}
+	typee = processor.GetArtifactType(nil, art)
+	d.Equal(ArtifactTypeUnknown, typee)
+
+	mediaType = "application/vnd.nhl.peanut.butter.bagel"
+	art = &artifact.Artifact{MediaType: mediaType}
+	processor = &defaultProcessor{}
+	typee = processor.GetArtifactType(nil, art)
+	d.Equal(ArtifactTypeUnknown, typee)
+
 	mediaType = "application/vnd.oci.image.config.v1+json"
 	art = &artifact.Artifact{MediaType: mediaType}
 	processor = &defaultProcessor{}
@@ -185,6 +222,19 @@ func (d *defaultProcessorTestSuite) TestAbstractMetadata() {
 	d.Require().Nil(err)
 }
 
+func (d *defaultProcessorTestSuite) TestAbstractMetadataWithUnknownConfig() {
+	manifest, _, err := distribution.UnmarshalManifest(v1.MediaTypeImageManifest, []byte(v2ManifestWithUnknownConfig))
+	d.Require().Nil(err)
+	manifestMediaType, content, err := manifest.Payload()
+	d.Require().Nil(err)
+
+	art := &artifact.Artifact{ManifestMediaType: manifestMediaType}
+	err = d.processor.AbstractMetadata(nil, art, content)
+	d.Require().Nil(err)
+	d.Assert().Equal(35, len(unknownConfig))
+	d.Assert().Equal(0, len(art.ExtraAttrs))
+}
+
 func TestDefaultProcessorTestSuite(t *testing.T) {
 	suite.Run(t, &defaultProcessorTestSuite{})
 }