diff --git a/src/sgwu/gtp-path.c b/src/sgwu/gtp-path.c
index c523e3e3c5..b72f1aa5db 100644
--- a/src/sgwu/gtp-path.c
+++ b/src/sgwu/gtp-path.c
@@ -124,6 +124,12 @@ static void _gtpv1_u_recv_cb(short when, ogs_socket_t fd, void *data)
         ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
         goto cleanup;
     }
+    if (gtp_h->type != OGS_GTPU_MSGTYPE_END_MARKER &&
+        pkbuf->len <= len) {
+        ogs_error("[DROP] Small GTPU packet(type:%d len:%d)", gtp_h->type, len);
+        ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
+        goto cleanup;
+    }
     ogs_assert(ogs_pkbuf_pull(pkbuf, len));
 
     if (gtp_h->type == OGS_GTPU_MSGTYPE_END_MARKER) {
diff --git a/src/smf/gtp-path.c b/src/smf/gtp-path.c
index 8e825fe62c..821341ce83 100644
--- a/src/smf/gtp-path.c
+++ b/src/smf/gtp-path.c
@@ -186,6 +186,12 @@ static void _gtpv1_u_recv_cb(short when, ogs_socket_t fd, void *data)
         ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
         goto cleanup;
     }
+    if (gtp_h->type != OGS_GTPU_MSGTYPE_END_MARKER &&
+        pkbuf->len <= len) {
+        ogs_error("[DROP] Small GTPU packet(type:%d len:%d)", gtp_h->type, len);
+        ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
+        goto cleanup;
+    }
     ogs_assert(ogs_pkbuf_pull(pkbuf, len));
 
     if (gtp_h->type == OGS_GTPU_MSGTYPE_GPDU) {
diff --git a/src/upf/gtp-path.c b/src/upf/gtp-path.c
index b18b7c51b9..95bb5b99ac 100644
--- a/src/upf/gtp-path.c
+++ b/src/upf/gtp-path.c
@@ -304,6 +304,12 @@ static void _gtpv1_u_recv_cb(short when, ogs_socket_t fd, void *data)
         ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
         goto cleanup;
     }
+    if (gtp_h->type != OGS_GTPU_MSGTYPE_END_MARKER &&
+        pkbuf->len <= len) {
+        ogs_error("[DROP] Small GTPU packet(type:%d len:%d)", gtp_h->type, len);
+        ogs_log_hexdump(OGS_LOG_ERROR, pkbuf->data, pkbuf->len);
+        goto cleanup;
+    }
     ogs_assert(ogs_pkbuf_pull(pkbuf, len));
 
     if (gtp_h->type == OGS_GTPU_MSGTYPE_END_MARKER) {