diff --git a/src/networking.c b/src/networking.c
index c24a95019b..e823ee0473 100644
--- a/src/networking.c
+++ b/src/networking.c
@@ -167,6 +167,7 @@ client *createClient(connection *conn) {
     c->nread = 0;
     c->read_flags = 0;
     c->write_flags = 0;
+    c->io_checked = 0;
     c->cmd = c->lastcmd = c->realcmd = c->io_parsed_cmd = NULL;
     c->cur_script = NULL;
     c->multibulklen = 0;
@@ -4832,6 +4833,13 @@ void ioThreadReadQueryFromClient(void *data) {
         goto done;
     }
 
+    /* Handle possible security attacks. */
+    if (!strcasecmp(c->argv[0]->ptr, "host:") || !strcasecmp(c->argv[0]->ptr, "post")) {
+        c->io_checked = IO_CHECKED_NOT_SECURITY;
+    } else {
+        c->io_checked = IO_CHECKED_SECURITY;
+    }
+
     /* Lookup command offload */
     c->io_parsed_cmd = lookupCommand(c->argv, c->argc);
     if (c->io_parsed_cmd && commandCheckArity(c->io_parsed_cmd, c->argc, NULL) == 0) {
diff --git a/src/server.c b/src/server.c
index ab95f84346..a8940b2550 100644
--- a/src/server.c
+++ b/src/server.c
@@ -3829,7 +3829,8 @@ int processCommand(client *c) {
     }
 
     /* Handle possible security attacks. */
-    if (!strcasecmp(c->argv[0]->ptr, "host:") || !strcasecmp(c->argv[0]->ptr, "post")) {
+    if (c->io_checked == IO_CHECKED_NOT_SECURITY ||
+        (!c->io_checked && (!strcasecmp(c->argv[0]->ptr, "host:") || !strcasecmp(c->argv[0]->ptr, "post")))) {
         securityWarningCommand(c);
         return C_ERR;
     }
diff --git a/src/server.h b/src/server.h
index 4fad8d2508..25988f4e9c 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1148,6 +1148,12 @@ typedef enum {
     CLIENT_COMPLETED_IO = 2 /* IO-thread sets this state after completing IO operation. */
 } clientIOState;
 
+typedef enum {
+    IO_NOT_CHECKED = 0,             /* Initial state: io thread doesn't check anything yet. */
+    IO_CHECKED_SECURITY = 1,        /* IO checked, there is no possible security attacks. */
+    IO_CHECKED_NOT_SECURITY = 2     /* IO checked, there is possible security attacks. */
+} ioCheckedState;
+
 typedef struct ClientFlags {
     uint64_t primary : 1;                  /* This client is a primary */
     uint64_t replica : 1;                  /* This client is a replica */
@@ -1251,6 +1257,9 @@ typedef struct client {
     size_t argv_len_sum;                 /* Sum of lengths of objects in argv list. */
     volatile uint8_t io_read_state;      /* Indicate the IO read state of the client */
     volatile uint8_t io_write_state;     /* Indicate the IO write state of the client */
+    uint8_t io_checked;                  /* Indicate if the logic is already covered in io-thread,
+                                          * then reduce the logic in main thread.
+                                          * For example, the possible security attacks check of command. */
     uint8_t cur_tid;                     /* ID of IO thread currently performing IO for this client */
     int nread;                           /* Number of bytes of the last read. */
     int nwritten;                        /* Number of bytes of the last write. */