diff --git a/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp b/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp
index 91d4266c5a..10d7eca155 100644
--- a/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp
+++ b/samples/cpp/tutorial_code/ImgTrans/HoughLines_Demo.cpp
@@ -71,8 +71,7 @@ int main( int argc, char** argv )
    namedWindow( probabilistic_name, WINDOW_AUTOSIZE );
    createTrackbar( thresh_label, probabilistic_name, &p_trackbar, max_trackbar, Probabilistic_Hough );
 
-   char edge_thresh_label[50];
-   sprintf( edge_thresh_label, "Edge Thres: input" );
+   const char* edge_thresh_label = "Edge Thres: input";
    namedWindow( weighted_name, WINDOW_AUTOSIZE);
    createTrackbar( edge_thresh_label, weighted_name, &e_trackbar, max_trackbar, Weighted_Hough);
    createTrackbar( thresh_label, weighted_name, &w_trackbar, weightedhough_max_trackbar, Weighted_Hough);
diff --git a/samples/cpp/tutorial_code/objectDetection/aruco_samples_utility.hpp b/samples/cpp/tutorial_code/objectDetection/aruco_samples_utility.hpp
index 05c52e1133..efac6cd5c6 100644
--- a/samples/cpp/tutorial_code/objectDetection/aruco_samples_utility.hpp
+++ b/samples/cpp/tutorial_code/objectDetection/aruco_samples_utility.hpp
@@ -32,7 +32,7 @@ inline static bool saveCameraParams(const std::string &filename, cv::Size imageS
     if (flags & cv::CALIB_FIX_ASPECT_RATIO) fs << "aspectRatio" << aspectRatio;
 
     if (flags != 0) {
-        sprintf(buf, "flags: %s%s%s%s",
+        snprintf(buf, sizeof(buf), "flags: %s%s%s%s",
                 flags & cv::CALIB_USE_INTRINSIC_GUESS ? "+use_intrinsic_guess" : "",
                 flags & cv::CALIB_FIX_ASPECT_RATIO ? "+fix_aspectRatio" : "",
                 flags & cv::CALIB_FIX_PRINCIPAL_POINT ? "+fix_principal_point" : "",
diff --git a/samples/opengl/opengl_interop.cpp b/samples/opengl/opengl_interop.cpp
index 8d3e0f8d47..d8b930545b 100644
--- a/samples/opengl/opengl_interop.cpp
+++ b/samples/opengl/opengl_interop.cpp
@@ -221,17 +221,17 @@ public:
             int  y = 0;
 
             buf[0] = 0;
-            sprintf_s(buf, sizeof(buf)-1, "Mode: %s OpenGL %s", m_modeStr[mode].c_str(), use_buffer() ? "buffer" : "texture");
+            snprintf(buf, sizeof(buf), "Mode: %s OpenGL %s", m_modeStr[mode].c_str(), use_buffer() ? "buffer" : "texture");
             ::TextOut(hDC, 0, y, buf, (int)strlen(buf));
 
             y += tm.tmHeight;
             buf[0] = 0;
-            sprintf_s(buf, sizeof(buf)-1, "Time, msec: %2.1f", time);
+            snprintf(buf, sizeof(buf), "Time, msec: %2.1f", time);
             ::TextOut(hDC, 0, y, buf, (int)strlen(buf));
 
             y += tm.tmHeight;
             buf[0] = 0;
-            sprintf_s(buf, sizeof(buf)-1, "OpenCL device: %s", oclDevName.c_str());
+            snprintf(buf, sizeof(buf), "OpenCL device: %s", oclDevName.c_str());
             ::TextOut(hDC, 0, y, buf, (int)strlen(buf));
 
             ::SelectObject(hDC, hOldFont);