diff --git a/source/libs/transport/inc/transComm.h b/source/libs/transport/inc/transComm.h
index 6b52c74271..1efb0bb316 100644
--- a/source/libs/transport/inc/transComm.h
+++ b/source/libs/transport/inc/transComm.h
@@ -98,6 +98,7 @@ typedef void* queue[2];
 #define TRANS_RETRY_INTERVAL    15    // retry interval (ms)
 #define TRANS_CONN_TIMEOUT      3     // connect timeout (s)
 #define TRANS_READ_TIMEOUT      3000  // read timeout  (ms)
+#define TRANS_PACKET_LIMIT      1024 * 1024 * 512
 
 typedef SRpcMsg      STransMsg;
 typedef SRpcCtx      STransCtx;
diff --git a/source/libs/transport/src/transComm.c b/source/libs/transport/src/transComm.c
index 4272ec0b1c..af49e5845b 100644
--- a/source/libs/transport/src/transComm.c
+++ b/source/libs/transport/src/transComm.c
@@ -112,15 +112,20 @@ int transClearBuffer(SConnBuffer* buf) {
 }
 
 int transDumpFromBuffer(SConnBuffer* connBuf, char** buf) {
+  static const int HEADSIZE = sizeof(STransMsgHead);
+
   SConnBuffer* p = connBuf;
   if (p->left != 0) {
     return -1;
   }
   int total = connBuf->total;
-  *buf = taosMemoryCalloc(1, total);
-  memcpy(*buf, p->buf, total);
-
-  transResetBuffer(connBuf);
+  if (total >= HEADSIZE) {
+    *buf = taosMemoryCalloc(1, total);
+    memcpy(*buf, p->buf, total);
+    transResetBuffer(connBuf);
+  } else {
+    total = -1;
+  }
   return total;
 }
 
diff --git a/source/libs/transport/src/transSvr.c b/source/libs/transport/src/transSvr.c
index 3512b27bf8..a94eb01beb 100644
--- a/source/libs/transport/src/transSvr.c
+++ b/source/libs/transport/src/transSvr.c
@@ -184,10 +184,15 @@ static void uvHandleActivityTimeout(uv_timer_t* handle) {
 }
 
 static void uvHandleReq(SSvrConn* pConn) {
-  STransMsgHead* msg = NULL;
-  int            msgLen = 0;
+  STrans* pTransInst = pConn->pTransInst;
 
-  msgLen = transDumpFromBuffer(&pConn->readBuf, (char**)&msg);
+  STransMsgHead* msg = NULL;
+  int            msgLen = transDumpFromBuffer(&pConn->readBuf, (char**)&msg);
+  if (msgLen <= 0) {
+    tError("%s conn %p alread read complete packet", transLabel(pTransInst), pConn);
+    transUnrefSrvHandle(pConn);
+    return;
+  }
 
   STransMsgHead* pHead = (STransMsgHead*)msg;
   pHead->code = htonl(pHead->code);
@@ -220,7 +225,6 @@ static void uvHandleReq(SSvrConn* pConn) {
       tDebug("conn %p acquired by server app", pConn);
     }
   }
-  STrans*   pTransInst = pConn->pTransInst;
   STraceId* trace = &pHead->traceId;
   if (pConn->status == ConnNormal && pHead->noResp == 0) {
     transRefSrvHandle(pConn);
@@ -268,11 +272,17 @@ void uvOnRecvCb(uv_stream_t* cli, ssize_t nread, const uv_buf_t* buf) {
   if (nread > 0) {
     pBuf->len += nread;
     tTrace("%s conn %p total read:%d, current read:%d", transLabel(pTransInst), conn, pBuf->len, (int)nread);
-    while (transReadComplete(pBuf)) {
-      tTrace("%s conn %p alread read complete packet", transLabel(pTransInst), conn);
-      uvHandleReq(conn);
+    if (pBuf->len <= TRANS_PACKET_LIMIT) {
+      while (transReadComplete(pBuf)) {
+        tTrace("%s conn %p alread read complete packet", transLabel(pTransInst), conn);
+        uvHandleReq(conn);
+      }
+      return;
+    } else {
+      tError("%s conn %p read unexpected packet, exceed limit", transLabel(pTransInst), conn);
+      destroyConn(conn, true);
+      return;
     }
-    return;
   }
   if (nread == 0) {
     return;