diff --git a/binary-versions.json b/binary-versions.json
index 66e803966..3ea61ac0f 100644
--- a/binary-versions.json
+++ b/binary-versions.json
@@ -4,7 +4,7 @@
     "repository": "Autonomy-Logic/xml2st"
   },
   "strucpp": {
-    "version": "v0.5.7",
+    "version": "v0.5.8",
     "repository": "Autonomy-Logic/STruCpp"
   }
 }
diff --git a/resources/sources/arduino/arduino_runtime_glue.cpp b/resources/sources/arduino/arduino_runtime_glue.cpp
index c7ea73e6b..6e99fd368 100644
--- a/resources/sources/arduino/arduino_runtime_glue.cpp
+++ b/resources/sources/arduino/arduino_runtime_glue.cpp
@@ -19,6 +19,21 @@
 #include "generated.hpp"
 #include "debug_dispatch.hpp"
 
+// ---------------------------------------------------------------------------
+// Runtime fault hook
+// ---------------------------------------------------------------------------
+// Weak default for strucpp::iec_runtime_fault (declared in iec_fault.hpp).
+// On MCU firmware (compiled -fno-exceptions) the runtime calls this instead
+// of throwing on an unrecoverable fault (null deref, array OOB, bad located
+// address). Default behaviour: halt. A VPP HAL may provide a STRONG override
+// to signal the fault its own way — blink a status LED, sound an alarm,
+// reboot, etc. Kept free of <Arduino.h> so this TU stays macro-clean.
+__attribute__((weak)) void strucpp::iec_runtime_fault(strucpp::IecFault /*reason*/,
+                                                       const char* /*context*/) noexcept {
+    for (;;) {
+    }
+}
+
 // ---------------------------------------------------------------------------
 // Storage
 // ---------------------------------------------------------------------------