diff --git a/trunk/doc/CHANGELOG.md b/trunk/doc/CHANGELOG.md
index bfb95dd41..36e815e91 100644
--- a/trunk/doc/CHANGELOG.md
+++ b/trunk/doc/CHANGELOG.md
@@ -7,6 +7,7 @@ The changelog for SRS.
 <a name="v7-changes"></a>
 
 ## SRS 7.0 Changelog
+* v7.0, 2025-08-12, Merge [#4301](https://github.com/ossrs/srs/pull/4301): Valgrind: Return error for unsupported check=new on Valgrind < 3.21. v7.0.52 (#4301)
 * v7.0, 2025-08-12, Merge [#4431](https://github.com/ossrs/srs/pull/4431): fix srt cmake 4.x compiling error. v7.0.52 (#4431)
 * v7.0, 2025-08-11, Merge [#4433](https://github.com/ossrs/srs/pull/4433): Use clang format. v7.0.52 (#4433)
 * v7.0, 2025-08-11, Merge [#4159](https://github.com/ossrs/srs/pull/4159): Feature: Support HLS with fmp4 segment for HEVC/LLHLS. v7.0.51 (#4159)
diff --git a/trunk/src/app/srs_app_http_api.cpp b/trunk/src/app/srs_app_http_api.cpp
index e2b1382ca..45a111694 100644
--- a/trunk/src/app/srs_app_http_api.cpp
+++ b/trunk/src/app/srs_app_http_api.cpp
@@ -1118,13 +1118,6 @@ srs_error_t SrsGoApiValgrind::serve_http(ISrsHttpResponseWriter *w, ISrsHttpMess
 {
     srs_error_t err = srs_success;
 
-    if (!trd_) {
-        trd_ = new SrsSTCoroutine("valgrind", this, _srs_context->get_id());
-        if ((err = trd_->start()) != srs_success) {
-            return srs_error_wrap(err, "start");
-        }
-    }
-
     string check = r->query_get("check");
     srs_trace("query check=%s", check.c_str());
 
@@ -1134,6 +1127,22 @@ srs_error_t SrsGoApiValgrind::serve_http(ISrsHttpResponseWriter *w, ISrsHttpMess
         check = "full";
     }
 
+    // Check if 'new' leak check is supported in current Valgrind version
+    if (check == "new") {
+#if !defined(VALGRIND_DO_NEW_LEAK_CHECK)
+        return srs_error_new(ERROR_NOT_SUPPORTED,
+                             "valgrind?check=new requires Valgrind 3.21+, current version is %d.%d",
+                             __VALGRIND_MAJOR__, __VALGRIND_MINOR__);
+#endif
+    }
+
+    if (!trd_) {
+        trd_ = new SrsSTCoroutine("valgrind", this, _srs_context->get_id());
+        if ((err = trd_->start()) != srs_success) {
+            return srs_error_wrap(err, "start");
+        }
+    }
+
     // By default, response the json style response.
     SrsUniquePtr<SrsJsonObject> obj(SrsJsonAny::object());
 
diff --git a/trunk/src/kernel/srs_kernel_error.hpp b/trunk/src/kernel/srs_kernel_error.hpp
index dee33553e..bff4a6edd 100644
--- a/trunk/src/kernel/srs_kernel_error.hpp
+++ b/trunk/src/kernel/srs_kernel_error.hpp
@@ -109,7 +109,8 @@
     XX(ERROR_SYSTEM_FILE_SETVBUF, 1096, "FileSetVBuf", "Failed to set file vbuf")                                      \
     XX(ERROR_NO_SOURCE, 1097, "NoSource", "No source found")                                                           \
     XX(ERROR_STREAM_DISPOSING, 1098, "StreamDisposing", "Stream is disposing")                                         \
-    XX(ERROR_NOT_IMPLEMENTED, 1099, "NotImplemented", "Feature is not implemented")
+    XX(ERROR_NOT_IMPLEMENTED, 1099, "NotImplemented", "Feature is not implemented")                                    \
+    XX(ERROR_NOT_SUPPORTED, 1100, "NotSupported", "Feature is not supported")
 
 /**************************************************/
 /* RTMP protocol error. */