diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 5e5e41ba4..38beaa743 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -5308,6 +5308,26 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <!-- errno_t _mbscat_s(unsigned char *strDestination, size_t numberOfElements, const unsigned char *strSource ); -->
+  <function name="_mbscat_s">
+    <returnValue type="errno_t"/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+      <minsize type="argvalue" arg="2"/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="3">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- Intrinsic __noop https://docs.microsoft.com/en-us/cpp/intrinsics/noop -->
   <function name="__noop">
     <noreturn>false</noreturn>
diff --git a/test/cfg/windows.cpp b/test/cfg/windows.cpp
index 57df97827..2d5b610ab 100644
--- a/test/cfg/windows.cpp
+++ b/test/cfg/windows.cpp
@@ -793,3 +793,33 @@ unsigned char * nullPointer_mbscat(unsigned char *strDestination, const unsigned
     // no warning shall be shown for
     return _mbscat(strDestination,strSource);
 }
+
+// errno_t _mbscat_s(unsigned char *strDestination, size_t numberOfElements, const unsigned char *strSource );
+error_t uninitvar_mbscat_s(unsigned char *strDestination, size_t numberOfElements, const unsigned char *strSource)
+{
+    unsigned char *uninit_strDestination;
+    size_t uninit_numberOfElements;
+    unsigned char *uninit_strSource;
+
+    // cppcheck-suppress uninitvar
+    (void)_mbscat_s(uninit_strDestination, numberOfElements, strSource);
+    // cppcheck-suppress uninitvar
+    (void)_mbscat_s(strDestination, uninit_numberOfElements, strSource);
+    // cppcheck-suppress uninitvar
+    (void)_mbscat_s(strDestination, numberOfElements, uninit_strSource);
+
+    // no warning shall be shown for
+    return _mbscat_s(strDestination, numberOfElements, strSource);
+}
+
+// errno_t _mbscat_s(unsigned char *strDestination, size_t numberOfElements, const unsigned char *strSource );
+error_t nullPointer_mbscat_s(unsigned char *strDestination, size_t numberOfElements, const unsigned char *strSource)
+{
+    // cppcheck-suppress nullPointer
+    (void)_mbscat_s(0, numberOfElements, strSource);
+    // cppcheck-suppress nullPointer
+    (void)_mbscat_s(strDestination, numberOfElements, 0);
+
+    // no warning shall be shown for
+    return _mbscat_s(strDestination, numberOfElements, strSource);
+}