diff --git a/extras/tests/MsgPackDeserializer/errors.cpp b/extras/tests/MsgPackDeserializer/errors.cpp
index 01e761af..dff712ab 100644
--- a/extras/tests/MsgPackDeserializer/errors.cpp
+++ b/extras/tests/MsgPackDeserializer/errors.cpp
@@ -199,3 +199,44 @@ TEST_CASE(
     REQUIRE(err == DeserializationError::NoMemory);
   }
 }
+
+TEST_CASE(
+    "deserializeMsgPack() returns NoMemory if extension allocation fails") {
+  JsonDocument doc(FailingAllocator::instance());
+
+  SECTION("uint32_t should pass") {
+    auto err = deserializeMsgPack(doc, "\xceXXXX");
+
+    REQUIRE(err == DeserializationError::Ok);
+  }
+
+  SECTION("uint64_t should fail") {
+    auto err = deserializeMsgPack(doc, "\xcfXXXXXXXX");
+
+    REQUIRE(err == DeserializationError::NoMemory);
+  }
+
+  SECTION("int32_t should pass") {
+    auto err = deserializeMsgPack(doc, "\xd2XXXX");
+
+    REQUIRE(err == DeserializationError::Ok);
+  }
+
+  SECTION("int64_t should fail") {
+    auto err = deserializeMsgPack(doc, "\xd3XXXXXXXX");
+
+    REQUIRE(err == DeserializationError::NoMemory);
+  }
+
+  SECTION("float should pass") {
+    auto err = deserializeMsgPack(doc, "\xcaXXXX");
+
+    REQUIRE(err == DeserializationError::Ok);
+  }
+
+  SECTION("double should fail") {
+    auto err = deserializeMsgPack(doc, "\xcbXXXXXXXX");
+
+    REQUIRE(err == DeserializationError::NoMemory);
+  }
+}
diff --git a/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp b/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
index 7b64299a..0c32f58b 100644
--- a/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
+++ b/src/ArduinoJson/MsgPack/MsgPackDeserializer.hpp
@@ -230,13 +230,16 @@ class MsgPackDeserializer {
 
     if (isSigned) {
       auto truncatedValue = static_cast<JsonInteger>(signedValue);
-      if (truncatedValue == signedValue)
-        variant->setInteger(truncatedValue, resources_);
+      if (truncatedValue == signedValue) {
+        if (!variant->setInteger(truncatedValue, resources_))
+          return DeserializationError::NoMemory;
+      }
       // else set null on overflow
     } else {
       auto truncatedValue = static_cast<JsonUInt>(unsignedValue);
       if (truncatedValue == unsignedValue)
-        variant->setInteger(truncatedValue, resources_);
+        if (!variant->setInteger(truncatedValue, resources_))
+          return DeserializationError::NoMemory;
       // else set null on overflow
     }
 
@@ -270,9 +273,10 @@ class MsgPackDeserializer {
       return err;
 
     fixEndianness(value);
-    variant->setFloat(value, resources_);
-
-    return DeserializationError::Ok;
+    if (variant->setFloat(value, resources_))
+      return DeserializationError::Ok;
+    else
+      return DeserializationError::NoMemory;
   }
 
   template <typename T>