diff --git a/src/libs/qtcreatorcdbext/pytype.cpp b/src/libs/qtcreatorcdbext/pytype.cpp
index 2525a65114e..38bb73bc0f0 100644
--- a/src/libs/qtcreatorcdbext/pytype.cpp
+++ b/src/libs/qtcreatorcdbext/pytype.cpp
@@ -40,6 +40,8 @@
 #include <dbghelp.h>
 #endif
 
+#include <regex>
+
 constexpr bool debugPyType = false;
 constexpr bool debuggingTypeEnabled() { return debugPyType || debugPyCdbextModule; }
 
@@ -411,6 +413,10 @@ PyType PyType::lookupType(const std::string &typeNameIn, ULONG64 module)
     if (typeName == "__int64" || typeName == "unsigned __int64")
         typeName.erase(typeName.find("__"), 2);
 
+    const static std::regex typeNameRE("^[a-zA-Z_][a-zA-Z0-9_]*!?[a-zA-Z0-9_<>:, \\*\\&\\[\\]]*$");
+    if (!std::regex_match(typeName, typeNameRE))
+        return PyType();
+
     CIDebugSymbols *symbols = ExtensionCommandContext::instance()->symbols();
     ULONG typeId;
     HRESULT result = S_FALSE;