diff --git a/go.mod b/go.mod
index 6ff1dab..b06ad71 100644
--- a/go.mod
+++ b/go.mod
@@ -19,7 +19,7 @@ require (
 	github.com/uptrace/bun/dialect/sqlitedialect v1.2.16
 	github.com/uptrace/bun/driver/sqliteshim v1.2.15
 	github.com/uptrace/bun/extra/bundebug v1.2.15
-	github.com/veraison/corim v1.1.3-0.20251209103150-ef6dbb7ed63f
+	github.com/veraison/corim v1.1.3-0.20251212144809-26e0f2a5f59d
 	github.com/veraison/eat v0.0.0-20210331113810-3da8a4dd42ff
 	github.com/veraison/swid v1.1.1-0.20251003121634-fd1f7f1e1897
 )
diff --git a/go.sum b/go.sum
index 29218b0..522b1f8 100644
--- a/go.sum
+++ b/go.sum
@@ -129,8 +129,8 @@ github.com/uptrace/bun/driver/sqliteshim v1.2.15 h1:M/rZJSjOPV4OmfTVnDPtL+wJmdMT
 github.com/uptrace/bun/driver/sqliteshim v1.2.15/go.mod h1:YqwxFyvM992XOCpGJtXyKPkgkb+aZpIIMzGbpaw1hIk=
 github.com/uptrace/bun/extra/bundebug v1.2.15 h1:IY2Z/pVyVg0ApWnQ/pEnwe6BWxlDDATCz7IFZghutCs=
 github.com/uptrace/bun/extra/bundebug v1.2.15/go.mod h1:JuE+BT7NjTZ9UKr74eC8s9yZ9dnQCeufDwFRTC8w3Xo=
-github.com/veraison/corim v1.1.3-0.20251209103150-ef6dbb7ed63f h1:ANVwskQLZ0YEzivFZqreGIftxakfd579fpOcjU8rHjo=
-github.com/veraison/corim v1.1.3-0.20251209103150-ef6dbb7ed63f/go.mod h1:96PQ0lk+O9bzutKTDz66G2DaARYUp1BeR06EYwEwSH0=
+github.com/veraison/corim v1.1.3-0.20251212144809-26e0f2a5f59d h1:ifSo+6zUb8I7yOBF1MgZflJwXmCYiZmiemd74VDcJW0=
+github.com/veraison/corim v1.1.3-0.20251212144809-26e0f2a5f59d/go.mod h1:96PQ0lk+O9bzutKTDz66G2DaARYUp1BeR06EYwEwSH0=
 github.com/veraison/eat v0.0.0-20210331113810-3da8a4dd42ff h1:r6I2eJL/z8dp5flsQIKHMeDjyV6UO8If3MaVBLvTjF4=
 github.com/veraison/eat v0.0.0-20210331113810-3da8a4dd42ff/go.mod h1:+kxt8iuFiVvKRs2VQ1Ho7bbAScXAB/kHFFuP5Biw19I=
 github.com/veraison/go-cose v1.2.1 h1:Gj4x20D0YP79J2+cK3anjGEMwIkg2xX+TKVVGUXwNAc=
diff --git a/pkg/model/extension.go b/pkg/model/extension.go
index e5b66d5..5e1fa26 100644
--- a/pkg/model/extension.go
+++ b/pkg/model/extension.go
@@ -17,7 +17,7 @@ func CoRIMExtensionsFromCoRIM(origin corim.Extensions) ([]*ExtensionValue, error
 }
 
 func CoMIDExtensionsFromCoRIM(origin comid.Extensions) ([]*ExtensionValue, error) {
-	var ret []*ExtensionValue
+	var ret []*ExtensionValue // nolint: prealloc
 	if origin.IsEmpty() {
 		return ret, nil
 	}
@@ -78,6 +78,21 @@ func CoMIDExtensionsFromCoRIM(origin comid.Extensions) ([]*ExtensionValue, error
 		ret = append(ret, &retVal)
 	}
 
+	for k, v := range origin.Cached {
+		bytes, err := cbor.Marshal(v)
+		if err != nil {
+			return nil, fmt.Errorf("error CBOR encoding cached extension %s: %w", k, err)
+		}
+
+		retVal := ExtensionValue{
+			FieldName:  "", // empty field name indicates cached value
+			JSONTag:    k,
+			ValueBytes: bytes,
+		}
+
+		ret = append(ret, &retVal)
+	}
+
 	return ret, nil
 }
 
@@ -91,12 +106,24 @@ func CoMIDExtensionsToCoRIM(origin []*ExtensionValue) (comid.Extensions, error)
 		return comid.Extensions{}, nil
 	}
 
-	values := make([]any, 0, len(origin))
+	values := make(map[string]any, len(origin))
 	fields := make([]reflect.StructField, 0, len(origin))
+	cached := make(map[string]any, len(origin))
 
 	for _, origVal := range origin {
 		var val any
 
+		if origVal.FieldName == "" {
+			// empty field name means this is a cached value
+			if err := cbor.Unmarshal(origVal.ValueBytes, &val); err != nil {
+				return comid.Extensions{}, fmt.Errorf(
+					"error decoding CBOR for %s: %w", origVal.JSONTag, err)
+			}
+
+			cached[origVal.JSONTag] = val
+			continue
+		}
+
 		switch origVal.FieldKind {
 		case reflect.String:
 			val = origVal.ValueText
@@ -147,17 +174,21 @@ func CoMIDExtensionsToCoRIM(origin []*ExtensionValue) (comid.Extensions, error)
 				origVal.CBORTag, origVal.JSONTag)),
 		})
 
-		values = append(values, val)
+		values[origVal.FieldName] = val
 	}
 
 	structType := reflect.StructOf(fields)
 	structPtr := reflect.New(structType)
 	structValue := structPtr.Elem()
 
-	for i, origVal := range origin {
+	for _, origVal := range origin {
+		if origVal.FieldName == "" {
+			continue
+		}
+
 		field := structValue.FieldByName(origVal.FieldName)
 		if field.IsValid() && field.CanSet() {
-			field.Set(reflect.ValueOf(values[i]))
+			field.Set(reflect.ValueOf(values[origVal.FieldName]))
 		} else {
 			return comid.Extensions{}, fmt.Errorf("could not set field %q", origVal.FieldName)
 		}
@@ -166,6 +197,10 @@ func CoMIDExtensionsToCoRIM(origin []*ExtensionValue) (comid.Extensions, error)
 	var ret comid.Extensions
 	ret.IMapValue = structPtr.Interface()
 
+	if len(cached) != 0 {
+		ret.Cached = cached
+	}
+
 	return ret, nil
 }
 
diff --git a/pkg/model/extension_test.go b/pkg/model/extension_test.go
index 95aaf26..0d56aff 100644
--- a/pkg/model/extension_test.go
+++ b/pkg/model/extension_test.go
@@ -37,10 +37,14 @@ func TestExtensionValue_round_trip(t *testing.T) {
 
 	var original comid.Extensions
 	original.Register(&extStruct)
+	original.Cached = map[string]any{
+		"-1":  uint64(7),
+		"fum": false,
+	}
 
 	extVals, err := CoMIDExtensionsFromCoRIM(original)
 	assert.NoError(t, err)
-	assert.Len(t, extVals, 8)
+	assert.Len(t, extVals, 10)
 
 	for _, ev := range extVals {
 		ev.OwnerID = 1
@@ -53,7 +57,7 @@ func TestExtensionValue_round_trip(t *testing.T) {
 
 	err = db.NewSelect().Model(&resVals).Scan(ctx)
 	assert.NoError(t, err)
-	assert.Len(t, resVals, 8)
+	assert.Len(t, resVals, 10)
 
 	returnedExts, err := CoMIDExtensionsToCoRIM(resVals)
 	assert.NoError(t, err)
@@ -63,6 +67,8 @@ func TestExtensionValue_round_trip(t *testing.T) {
 	val, err := returnedExts.Get("Qux")
 	assert.NoError(t, err)
 	assert.Equal(t, map[interface{}]interface{}{"Zap": true}, val)
+
+	assert.Equal(t, original.Cached, returnedExts.Cached)
 }
 
 func TestExtensionValue_Select(t *testing.T) {