diff --git a/packages/qvac-lib-inference-addon-cpp/CHANGELOG.md b/packages/qvac-lib-inference-addon-cpp/CHANGELOG.md
index c504c8cf00..25e0c04a8e 100644
--- a/packages/qvac-lib-inference-addon-cpp/CHANGELOG.md
+++ b/packages/qvac-lib-inference-addon-cpp/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [1.1.3] - 2026-03-18
+- Add native job IDs to queued addon events so JS callbacks can distinguish late cancel/error delivery from newer accepted jobs.
+- Extend JS callback delivery with a trailing native `jobId` argument while keeping existing 4-argument handlers compatible.
+- Make shared `cancel(handle, jobId)` honor the requested job ID while remaining backward compatible for existing callers that omit it.
+- Add addon-cpp regression coverage for late cancel ownership and stale cancel isolation.
+
 ## [1.1.2] - 2026-02-20
 Reduce noise from logs, macro for compile-time enabling of debug logs.
 
diff --git a/packages/qvac-lib-inference-addon-cpp/CMakeLists.txt b/packages/qvac-lib-inference-addon-cpp/CMakeLists.txt
index ff54cec513..7c50e8aebb 100644
--- a/packages/qvac-lib-inference-addon-cpp/CMakeLists.txt
+++ b/packages/qvac-lib-inference-addon-cpp/CMakeLists.txt
@@ -6,7 +6,7 @@ if(BUILD_TESTING)
 endif()
 
 project(qvac-lib-inference-addon-cpp
-  VERSION 1.1.2
+  VERSION 1.1.3
   LANGUAGES CXX)
 
 find_path(VCPKG_INSTALLED_PATH share/qvac-lint-cpp/.clang-format REQUIRED)
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JobRunner.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JobRunner.hpp
index 854f8de5c6..078e079319 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JobRunner.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JobRunner.hpp
@@ -43,12 +43,18 @@ class ProcessingSync {
 };
 
 class JobRunner {
+  struct PendingJob {
+    JobId jobId;
+    std::any input;
+  };
+
   std::shared_ptr<OutputQueue> outputQueue_;
   model::IModel* const model_;
   model::IModelCancel* const modelCancel_;
   mutable std::timed_mutex mtx_;
   mutable std::condition_variable_any processCv_;
-  std::optional<std::any> job_;
+  std::optional<PendingJob> job_;
+  JobId nextJobId_{1};
   mutable std::thread processingThread_;
   mutable std::atomic_bool running_ = false;
   mutable std::atomic_bool ready_ = false;
@@ -65,6 +71,7 @@ class JobRunner {
   void process() {
     while (running_) {
       std::unique_lock lock(mtx_);
+      std::optional<PendingJob> currentJob;
 
       try {
         // Signal that thread is ready for a new job
@@ -79,25 +86,31 @@ class JobRunner {
         // Acquire processing while holding the main `lock` for atomicity.
         ready_ = false;
         processingSync_.setActive(true);
+        currentJob = std::move(*job_);
 
         // Unlock main lock to ensure cancel() can acquire without blocking
         lock.unlock();
 
-        std::any output = model_->process(job_.value());
+        std::any output = model_->process(currentJob->input);
 
         // Make sure to reset job before queue result. Client might
         // be waiting to queue a new job as soon as current is ended.
         finalizeJob(lock);
 
-        outputQueue_->queueResult(std::move(output));
-        outputQueue_->queueJobEnded();
+        outputQueue_->queueResult(currentJob->jobId, std::move(output));
+        outputQueue_->queueJobEnded(currentJob->jobId);
       } catch (const std::exception& e) {
         finalizeJob(lock);
-        outputQueue_->queueException(e);
+        if (currentJob.has_value()) {
+          outputQueue_->queueException(currentJob->jobId, e);
+        }
       } catch (...) {
         finalizeJob(lock);
-        outputQueue_->queueException(
-            std::runtime_error("Unknown exception in processing loop"));
+        if (currentJob.has_value()) {
+          outputQueue_->queueException(
+              currentJob->jobId,
+              std::runtime_error("Unknown exception in processing loop"));
+        }
       }
     }
   }
@@ -144,26 +157,29 @@ class JobRunner {
       // Return a boolean instead.
       return false;
     }
-    job_ = std::move(input);
+    job_ = PendingJob{nextJobId_++, std::move(input)};
     lock.unlock();
     processCv_.notify_one();
     return true;
   }
 
-  void cancel() {
+  void cancel(std::optional<JobId> jobId = std::nullopt) {
     std::scoped_lock lock{mtx_};
     if (modelCancel_ == nullptr) {
       QLOG(logger::Priority::WARNING, "Model does not support cancellation");
       return;
     }
-    if (job_.has_value()) {
+    if (job_.has_value() &&
+        (!jobId.has_value() || job_->jobId == jobId.value())) {
+      const auto activeJobId = job_->jobId;
       modelCancel_->cancel();
       processingSync_.waitInactive();
       job_.reset();
       if (ready_.load()) {
         // If the worker has not taken the job yet (ready_ == true, still in
         // wait), it will never run queueJobEnded. Signal finished now.
-        outputQueue_->queueException(std::runtime_error("Job cancelled"));
+        outputQueue_->queueException(
+            activeJobId, std::runtime_error("Job cancelled"));
       }
     }
   }
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JsInterface.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JsInterface.hpp
index ba0ff92eb5..613f18ccb9 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JsInterface.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/JsInterface.hpp
@@ -279,7 +279,7 @@ class JsInterface {
       -> js_value_t* try {
     JsArgsParser argsParser(env, info);
     auto& instance = getInstance(env, argsParser.get(0, "instance"));
-    return instance.cancelJob();
+    return instance.cancelJob(argsParser.getIntegralOptional<JobId>(1));
   }
   JSCATCH
 };
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonCpp.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonCpp.hpp
index 938b6a1c73..bf83487650 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonCpp.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonCpp.hpp
@@ -59,7 +59,9 @@ class AddonCpp {
 
   /// @returns False if the job cannot be run (e.g. because a job is already set or being processed)
   bool runJob(std::any input) { return jobRunner_.runJob(std::move(input)); }
-  void cancelJob() { jobRunner_.cancel(); }
+  void cancelJob(std::optional<JobId> jobId = std::nullopt) {
+    jobRunner_.cancel(jobId);
+  }
 
   const std::reference_wrapper<model::IModel> model;
   model::IModelAsyncLoad* const asyncLoad;
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonJs.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonJs.hpp
index bd2f7255ec..2640bfffb2 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonJs.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/addon/AddonJs.hpp
@@ -42,9 +42,10 @@ class AddonJs {
    * @return JavaScript Promise that resolves when cancellation completes
    * @note This is a non-blocking operation that returns a future/promise
    */
-  js_value_t* cancelJob() {
+  js_value_t* cancelJob(std::optional<JobId> jobId = std::nullopt) {
     return js::JsAsyncTask::run(
-        env_, [addonCppRef = addonCpp]() { addonCppRef->cancelJob(); });
+        env_,
+        [addonCppRef = addonCpp, jobId]() { addonCppRef->cancelJob(jobId); });
   }
 
   /**
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackCpp.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackCpp.hpp
index 1ee2416a12..4129fb241b 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackCpp.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackCpp.hpp
@@ -64,16 +64,16 @@ class OutputCallBackCpp : public OutputCallBackInterface {
   /**
    * @brief Process output events using handlers
    */
-  void processEvent(const std::any& output) {
-    if (!output.has_value()) {
+  void processEvent(const QueuedOutputEvent& outputEvent) {
+    if (!outputEvent.payload.has_value()) {
       // e.g. JobStarted events don't have data
       return;
     }
 
     try {
       out_handl::OutputHandlerInterface<void>& handler =
-          outputHandlers_.get(output);
-      handler.handleOutput(output);
+          outputHandlers_.get(outputEvent.payload);
+      handler.handleOutput(outputEvent.payload);
     } catch (const std::exception& e) {
       QLOG(
           logger::Priority::ERROR,
@@ -97,7 +97,8 @@ class OutputCallBackCpp : public OutputCallBackInterface {
       }
 
       while (outputQueue_ != nullptr && !shouldStop_.load()) {
-        std::vector<std::any> outputQueue = std::move(outputQueue_->clear());
+        std::vector<QueuedOutputEvent> outputQueue =
+            std::move(outputQueue_->clear());
         lock.unlock();
 
         for (size_t i = 0; !shouldStop_.load() && i < outputQueue.size(); i++) {
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackJs.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackJs.hpp
index f078560b77..4d7a127584 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackJs.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputCallbackJs.hpp
@@ -86,24 +86,38 @@ class OutputCallBackJs : public OutputCallBackInterface {
   void stop() final { stopped_ = true; }
 
 private:
+  js_value_t* createEventName(const QueuedOutputEvent& outputEvent) {
+    switch (outputEvent.eventKind) {
+    case OutputEventKind::Output:
+      return js::String::create(env_, "Output");
+    case OutputEventKind::JobEnded:
+      return js::String::create(env_, "JobEnded");
+    case OutputEventKind::Error:
+      return js::String::create(env_, "Error");
+    }
+
+    return js::String::create(env_, "Output");
+  }
+
   /**
    * @brief Creates JavaScript parameters for output events using handlers
    * @returns Pair of JavaScript values for output data and error
    */
   std::pair<js_value_t*, js_value_t*>
-  createEventParams(const std::any& output) {
-    if (!output.has_value()) {
+  createEventParams(const QueuedOutputEvent& outputEvent) {
+    if (!outputEvent.payload.has_value()) {
       // e.g. JobStarted events don't have data
       return {js::Undefined::create(env_), js::Undefined::create(env_)};
     }
 
-    out_handl::JsOutputHandlerInterface& handler = outputHandlers_.get(output);
+    out_handl::JsOutputHandlerInterface& handler =
+        outputHandlers_.get(outputEvent.payload);
     handler.setEnv(env_);
-    js_value_t* handlerResult = handler.handleOutput(output);
+    js_value_t* handlerResult = handler.handleOutput(outputEvent.payload);
 
     // For Error events, put handler result in error parameter (second)
     // For other events, put handler result in output parameter (first)
-    if (output.type() == typeid(Output::Error)) {
+    if (outputEvent.eventKind == OutputEventKind::Error) {
       return {js::Undefined::create(env_), handlerResult};
     } else {
       return {handlerResult, js::Undefined::create(env_)};
@@ -116,15 +130,18 @@ class OutputCallBackJs : public OutputCallBackInterface {
    *   outputCbParameters[1] = Event string
    *   outputCbParameters[2] = Output data
    *   outputCbParameters[3] = Error data
+   *   outputCbParameters[4] = Native job ID
    */
   void createOutputCbParams(
-      js_value_t* jsHandle, const std::any& output,
+      js_value_t* jsHandle, const QueuedOutputEvent& outputEvent,
       js_value_t** outputCbParameters) {
     outputCbParameters[0] = jsHandle;
-    outputCbParameters[1] = js::String::create(env_, output.type().name());
+    outputCbParameters[1] = createEventName(outputEvent);
 
     std::tie(outputCbParameters[2], outputCbParameters[3]) =
-        createEventParams(output);
+        createEventParams(outputEvent);
+    outputCbParameters[4] =
+        js::Number::create(env_, static_cast<double>(outputEvent.jobId));
   }
 
   /**
@@ -146,7 +163,7 @@ class OutputCallBackJs : public OutputCallBackInterface {
     js_value_t* jsHandle;
     JS(js_get_reference_value(
         outputCallBackJs.env_, outputCallBackJs.jsHandle_, &jsHandle));
-    std::vector<std::any> outputQueue;
+    std::vector<QueuedOutputEvent> outputQueue;
     {
       std::scoped_lock lk{outputCallBackJs.mtx_};
       outputQueue = std::move(outputCallBackJs.outputQueue_->clear());
@@ -159,7 +176,7 @@ class OutputCallBackJs : public OutputCallBackInterface {
           utils::onExit([env = outputCallBackJs.env_, innerScope]() {
             js_close_handle_scope(env, innerScope);
           });
-      static constexpr auto outputCbParametersCount = 4;
+      static constexpr auto outputCbParametersCount = 5;
       js_value_t* outputCbParameters[outputCbParametersCount];
       outputCallBackJs.createOutputCbParams(
           jsHandle, outputQueue[i], outputCbParameters);
diff --git a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputQueue.hpp b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputQueue.hpp
index 6422424076..48374712ae 100644
--- a/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputQueue.hpp
+++ b/packages/qvac-lib-inference-addon-cpp/src/qvac-lib-inference-addon-cpp/queue/OutputQueue.hpp
@@ -15,6 +15,20 @@
 
 namespace qvac_lib_inference_addon_cpp {
 
+using JobId = uint64_t;
+
+enum class OutputEventKind {
+  Output,
+  JobEnded,
+  Error
+};
+
+struct QueuedOutputEvent {
+  JobId jobId;
+  OutputEventKind eventKind;
+  std::any payload;
+};
+
 namespace Output {
 struct LogMsg : std::string {
   using std::string::string;
@@ -27,14 +41,18 @@ struct Error : std::string {
 
 class OutputQueue {
   std::mutex mtx_;
-  std::vector<std::any> outputQueue_;
+  std::vector<QueuedOutputEvent> outputQueue_;
 
   const model::IModel& model_;
   OutputCallBackInterface& outputCallback_;
 
-  void queueOutput(std::any&& output) {
+  void queueOutput(JobId jobId, OutputEventKind eventKind, std::any&& output) {
     std::scoped_lock lk{mtx_};
-    outputQueue_.emplace_back(std::move(output));
+    outputQueue_.emplace_back(QueuedOutputEvent{
+        jobId,
+        eventKind,
+        std::move(output),
+    });
     outputCallback_.notify();
   }
 
@@ -46,24 +64,26 @@ class OutputQueue {
   ~OutputQueue() = default;
 
   /// @brief Returns the current output queue and clears the internal queue.
-  std::vector<std::any> clear() {
+  std::vector<QueuedOutputEvent> clear() {
     std::scoped_lock lk{mtx_};
     auto result = std::move(outputQueue_);
-    outputQueue_ = std::vector<std::any>();
+    outputQueue_ = std::vector<QueuedOutputEvent>();
     return result;
   }
 
-  void queueJobEnded() { return queueOutput(model_.runtimeStats()); }
+  void queueJobEnded(JobId jobId) {
+    return queueOutput(jobId, OutputEventKind::JobEnded, model_.runtimeStats());
+  }
 
-  void queueResult(std::any&& output) {
+  void queueResult(JobId jobId, std::any&& output) {
     QLOG_DEBUG(
         std::string("[OutputQueue] queueResult called with type: ") +
         output.type().name());
-    queueOutput(std::move(output));
+    queueOutput(jobId, OutputEventKind::Output, std::move(output));
   }
 
-  void queueException(const std::exception& exception) {
-    queueOutput(Output::Error{exception});
+  void queueException(JobId jobId, const std::exception& exception) {
+    queueOutput(jobId, OutputEventKind::Error, Output::Error{exception});
   }
 };
 } // namespace qvac_lib_inference_addon_cpp
diff --git a/packages/qvac-lib-inference-addon-cpp/tests/cpp_output_handler_test.cpp b/packages/qvac-lib-inference-addon-cpp/tests/cpp_output_handler_test.cpp
index 694b82f20a..943af9fdf0 100644
--- a/packages/qvac-lib-inference-addon-cpp/tests/cpp_output_handler_test.cpp
+++ b/packages/qvac-lib-inference-addon-cpp/tests/cpp_output_handler_test.cpp
@@ -98,7 +98,7 @@ TEST(CppOutputHandlerTest, OutputCallbackCppWithCustomStringHandler) {
       "Hello from OutputCallbackCpp!", "Second message", "Third message"};
 
   for (size_t i = 0; i < testStrings.size(); ++i) {
-    outputQueue->queueResult(std::any(testStrings[i]));
+    outputQueue->queueResult(static_cast<JobId>(i + 1), std::any(testStrings[i]));
   }
 
   // Pop items from the queue with timeout - no need for manual sleep
diff --git a/packages/qvac-lib-inference-addon-cpp/tests/job_runner_test.cpp b/packages/qvac-lib-inference-addon-cpp/tests/job_runner_test.cpp
index 177f7586b4..2840345834 100644
--- a/packages/qvac-lib-inference-addon-cpp/tests/job_runner_test.cpp
+++ b/packages/qvac-lib-inference-addon-cpp/tests/job_runner_test.cpp
@@ -207,7 +207,7 @@ TEST_F(JobRunnerTest, CancelBeforeJobThenRunNormally) {
   // Verify we got a result (not an error)
   bool found_result = false;
   for (const auto& output : outputs) {
-    if (output.type() == typeid(std::string)) {
+    if (output.payload.type() == typeid(std::string)) {
       found_result = true;
     }
   }
@@ -420,8 +420,8 @@ TEST_F(
   // Check output queue for bad_optional_access errors
   auto outputs = outputQueue_->clear();
   for (const auto& output : outputs) {
-    if (output.type() == typeid(Output::Error)) {
-      auto error = std::any_cast<Output::Error>(output);
+    if (output.payload.type() == typeid(Output::Error)) {
+      auto error = std::any_cast<Output::Error>(output.payload);
       if (error.find("bad_optional_access") != std::string::npos ||
           error.find("optional") != std::string::npos) {
         FAIL() << "BUG DETECTED: bad_optional_access in output after "
@@ -462,4 +462,78 @@ TEST_F(JobRunnerTest, MultipleCancelsInSequence) {
   SUCCEED();
 }
 
+TEST_F(JobRunnerTest, LateCancelEventsStayBoundToCancelledJob) {
+  model_ = std::make_unique<JobRunnerTestModel>(std::chrono::milliseconds{500});
+  outputQueue_ = std::make_shared<OutputQueue>(*callback_, *model_);
+  jobRunner_ =
+      std::make_unique<JobRunner>(outputQueue_, model_.get(), model_.get());
+  jobRunner_->start();
+
+  EXPECT_TRUE(jobRunner_->runJob(std::string("job-1")));
+  jobRunner_->cancel(1);
+
+  EXPECT_TRUE(jobRunner_->runJob(std::string("job-2")));
+  std::this_thread::sleep_for(std::chrono::milliseconds{700});
+
+  const auto outputs = outputQueue_->clear();
+  ASSERT_GE(outputs.size(), 3U);
+
+  bool sawJob1Cancel = false;
+  bool sawJob2Result = false;
+  bool sawJob2Ended = false;
+  for (const auto& output : outputs) {
+    if (output.jobId == 1 && output.payload.type() == typeid(Output::Error)) {
+      sawJob1Cancel =
+          std::any_cast<Output::Error>(output.payload) == "Job cancelled";
+    }
+    if (output.jobId == 2 && output.payload.type() == typeid(std::string)) {
+      sawJob2Result = std::any_cast<std::string>(output.payload) == "result";
+    }
+    if (output.jobId == 2 && output.payload.type() == typeid(RuntimeStats)) {
+      sawJob2Ended = true;
+    }
+  }
+
+  EXPECT_TRUE(sawJob1Cancel);
+  EXPECT_TRUE(sawJob2Result);
+  EXPECT_TRUE(sawJob2Ended);
+}
+
+TEST_F(JobRunnerTest, StaleCancelDoesNotClearNewerAcceptedJob) {
+  model_ = std::make_unique<JobRunnerTestModel>(std::chrono::milliseconds{150});
+  outputQueue_ = std::make_shared<OutputQueue>(*callback_, *model_);
+  jobRunner_ =
+      std::make_unique<JobRunner>(outputQueue_, model_.get(), model_.get());
+  jobRunner_->start();
+
+  EXPECT_TRUE(jobRunner_->runJob(std::string("job-1")));
+  std::this_thread::sleep_for(std::chrono::milliseconds{250});
+
+  EXPECT_TRUE(jobRunner_->runJob(std::string("job-2")));
+  jobRunner_->cancel(1);
+  std::this_thread::sleep_for(std::chrono::milliseconds{250});
+
+  const auto outputs = outputQueue_->clear();
+
+  bool sawJob2Result = false;
+  bool sawJob2Ended = false;
+  bool sawWrongJob2Cancel = false;
+  for (const auto& output : outputs) {
+    if (output.jobId == 2 && output.payload.type() == typeid(std::string)) {
+      sawJob2Result = true;
+    }
+    if (output.jobId == 2 && output.payload.type() == typeid(RuntimeStats)) {
+      sawJob2Ended = true;
+    }
+    if (output.jobId == 2 && output.payload.type() == typeid(Output::Error)) {
+      sawWrongJob2Cancel =
+          std::any_cast<Output::Error>(output.payload) == "Job cancelled";
+    }
+  }
+
+  EXPECT_TRUE(sawJob2Result);
+  EXPECT_TRUE(sawJob2Ended);
+  EXPECT_FALSE(sawWrongJob2Cancel);
+}
+
 } // namespace qvac_lib_inference_addon_cpp
diff --git a/packages/qvac-lib-inference-addon-cpp/vcpkg.json b/packages/qvac-lib-inference-addon-cpp/vcpkg.json
index 2d5f3aefcd..1f37c7ce78 100644
--- a/packages/qvac-lib-inference-addon-cpp/vcpkg.json
+++ b/packages/qvac-lib-inference-addon-cpp/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "qvac-lib-inference-addon-cpp",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "dependencies": [
     {
       "name": "qvac-lint-cpp",