diff -ru a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
--- a/src/http/modules/ngx_http_mp4_module.c	2018-03-20 15:58:32.000000000 +0000
+++ b/src/http/modules/ngx_http_mp4_module.c	2019-02-16 00:23:01.251999682 +0000
@@ -942,6 +942,13 @@
                 atom_size = ngx_mp4_get_64value(atom_header + 8);
                 atom_header_size = sizeof(ngx_mp4_atom_header64_t);
 
+		if (atom_size < sizeof(ngx_mp4_atom_header64_t)) {
+                    ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
+                                  "\"%s\" mp4 atom is too small:%uL",
+                                  mp4->file.name.data, atom_size);
+                    return NGX_ERROR;
+                }
+
             } else {
                 ngx_log_error(NGX_LOG_ERR, mp4->file.log, 0,
                               "\"%s\" mp4 atom is too small:%uL",