diff --git a/proxy/vmess/protocol/user/testing/mocks/static_userset.go b/proxy/vmess/protocol/user/testing/mocks/static_userset.go
new file mode 100644
index 00000000..faa9a648
--- /dev/null
+++ b/proxy/vmess/protocol/user/testing/mocks/static_userset.go
@@ -0,0 +1,29 @@
+package mocks
+
+import (
+	"github.com/v2ray/v2ray-core/proxy/vmess/config"
+)
+
+type StaticUser struct {
+	id *config.ID
+}
+
+func (this *StaticUser) ID() *config.ID {
+	return this.id
+}
+
+func (this *StaticUser) Level() config.UserLevel {
+	return config.UserLevelUntrusted
+}
+
+type StaticUserSet struct {
+}
+
+func (us *StaticUserSet) AddUser(user config.User) error {
+	return nil
+}
+
+func (us *StaticUserSet) GetUser(userhash []byte) (config.User, int64, bool) {
+	id, _ := config.NewID("703e9102-eb57-499c-8b59-faf4f371bb21")
+	return &StaticUser{id: id}, 0, true
+}
diff --git a/proxy/vmess/protocol/vmess_fuzz_test.go b/proxy/vmess/protocol/vmess_fuzz_test.go
new file mode 100644
index 00000000..83bb086b
--- /dev/null
+++ b/proxy/vmess/protocol/vmess_fuzz_test.go
@@ -0,0 +1,15 @@
+package protocol
+
+import (
+	"crypto/rand"
+	"testing"
+
+	"github.com/v2ray/v2ray-core/proxy/vmess/protocol/user/testing/mocks"
+)
+
+func TestVMessRequestReader(t *testing.T) {
+	reader := NewVMessRequestReader(&mocks.StaticUserSet{})
+	for i := 0; i < 10000000; i++ {
+		reader.Read(rand.Reader)
+	}
+}