diff --git a/lib/logger.cpp b/lib/logger.cpp
index cb1b573..abc1272 100755
--- a/lib/logger.cpp
+++ b/lib/logger.cpp
@@ -34,7 +34,8 @@ void log_debug(const char *fmt, ...)
     char msg[10000];
     va_list args;
     va_start(args, fmt);
-    vsprintf(msg, fmt, args);
+    //vsprintf(msg, fmt, args);
+    vsnprintf(msg, 10000, fmt, args); // Edited by Yi Zhang on 2022-12-17
     va_end(args);
 
     if(logger.level <= LOG_DEBUG)
@@ -55,7 +56,8 @@ void log_info(const char *fmt, ...)
     char msg[10000];
     va_list args;
     va_start(args, fmt);
-    vsprintf(msg, fmt, args);
+    //vsprintf(msg, fmt, args);
+    vsnprintf(msg, 10000, fmt, args); // Edited by Yi Zhang on 2022-12-17
     va_end(args);
 
     if(logger.level <= LOG_INFO)
@@ -76,7 +78,8 @@ void log_warning(const char *fmt, ...)
     char msg[10000];
     va_list args;
     va_start(args, fmt);
-    vsprintf(msg, fmt, args);
+    //vsprintf(msg, fmt, args);
+    vsnprintf(msg, 10000, fmt, args); // Edited by Yi Zhang on 2022-12-17
     va_end(args);
 
     if(logger.level <= LOG_WARNING)
@@ -97,7 +100,8 @@ void log_error(const char *fmt, ...)
     char msg[10000];
     va_list args;
     va_start(args, fmt);
-    vsprintf(msg, fmt, args);
+    //vsprintf(msg, fmt, args);
+    vsnprintf(msg, 10000, fmt, args); // Edited by Yi Zhang on 2022-12-17
     va_end(args);
 
     if(logger.level <= LOG_ERROR)