diff --git a/server/skillhub-app/src/main/java/com/iflytek/skillhub/exception/GlobalExceptionHandler.java b/server/skillhub-app/src/main/java/com/iflytek/skillhub/exception/GlobalExceptionHandler.java
index 44c9a004..851f6683 100644
--- a/server/skillhub-app/src/main/java/com/iflytek/skillhub/exception/GlobalExceptionHandler.java
+++ b/server/skillhub-app/src/main/java/com/iflytek/skillhub/exception/GlobalExceptionHandler.java
@@ -21,6 +21,7 @@ import org.springframework.validation.FieldError;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
 
 /**
  * Translates application, domain, auth, and infrastructure exceptions into the platform's JSON API
@@ -111,6 +112,19 @@ public class GlobalExceptionHandler {
                 apiResponseFactory.error(503, "error.storage.unavailable"));
     }
 
+    @ExceptionHandler(AsyncRequestTimeoutException.class)
+    public ResponseEntity<?> handleAsyncRequestTimeout(AsyncRequestTimeoutException ex, HttpServletRequest request) {
+        String path = request.getRequestURI();
+        if (path != null && path.endsWith("/sse")) {
+            logger.debug("SSE timeout [requestId={}, path={}]", MDC.get("requestId"), path);
+            return ResponseEntity.noContent().build();
+        }
+
+        logHandledException(HttpStatus.REQUEST_TIMEOUT, "error.request.timeout", request);
+        return ResponseEntity.status(HttpStatus.REQUEST_TIMEOUT).body(
+                apiResponseFactory.error(408, "error.request.timeout"));
+    }
+
     @ExceptionHandler(Exception.class)
     public ResponseEntity<ApiResponse<Void>> handleGlobalException(Exception ex, HttpServletRequest request) {
         logger.error(
@@ -122,7 +136,7 @@ public class GlobalExceptionHandler {
                 ex
         );
         return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(
-            apiResponseFactory.error(500, "error.internal"));
+                apiResponseFactory.error(500, "error.internal"));
     }
 
     private void logHandledException(HttpStatus status, String messageCode, HttpServletRequest request) {
diff --git a/server/skillhub-app/src/main/resources/messages.properties b/server/skillhub-app/src/main/resources/messages.properties
index 2a9acc9e..83ac024f 100644
--- a/server/skillhub-app/src/main/resources/messages.properties
+++ b/server/skillhub-app/src/main/resources/messages.properties
@@ -47,6 +47,7 @@ error.auth.sessionBootstrap.providerUnsupported=Unsupported session bootstrap pr
 error.auth.sessionBootstrap.notAuthenticated=No authenticated external session found
 error.badRequest=Invalid request
 error.forbidden=Forbidden
+error.request.timeout=Request timed out
 error.rateLimit.exceeded=Rate limit exceeded
 error.storage.unavailable=Object storage is temporarily unavailable. Please try again later.
 error.internal=An unexpected error occurred
diff --git a/server/skillhub-app/src/main/resources/messages_zh.properties b/server/skillhub-app/src/main/resources/messages_zh.properties
index 2f249b71..abb834c3 100644
--- a/server/skillhub-app/src/main/resources/messages_zh.properties
+++ b/server/skillhub-app/src/main/resources/messages_zh.properties
@@ -47,6 +47,7 @@ error.auth.sessionBootstrap.providerUnsupported=不支持的会话引导提供
 error.auth.sessionBootstrap.notAuthenticated=未检测到已认证的外部会话
 error.badRequest=请求参数不合法
 error.forbidden=没有权限执行该操作
+error.request.timeout=请求超时
 error.rateLimit.exceeded=请求过于频繁，请稍后再试
 error.storage.unavailable=对象存储暂时不可用，请稍后再试
 error.internal=服务器内部错误
diff --git a/server/skillhub-app/src/test/java/com/iflytek/skillhub/exception/GlobalExceptionHandlerTest.java b/server/skillhub-app/src/test/java/com/iflytek/skillhub/exception/GlobalExceptionHandlerTest.java
new file mode 100644
index 00000000..05b7ed16
--- /dev/null
+++ b/server/skillhub-app/src/test/java/com/iflytek/skillhub/exception/GlobalExceptionHandlerTest.java
@@ -0,0 +1,73 @@
+package com.iflytek.skillhub.exception;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+import com.iflytek.skillhub.dto.ApiResponse;
+import com.iflytek.skillhub.dto.ApiResponseFactory;
+import com.iflytek.skillhub.metrics.SkillHubMetrics;
+import com.iflytek.skillhub.security.SensitiveLogSanitizer;
+import jakarta.servlet.http.HttpServletRequest;
+import java.time.Clock;
+import java.time.Instant;
+import java.time.ZoneOffset;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.context.support.StaticMessageSource;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
+
+@ExtendWith(MockitoExtension.class)
+class GlobalExceptionHandlerTest {
+
+    @Mock
+    private SensitiveLogSanitizer sensitiveLogSanitizer;
+
+    @Mock
+    private SkillHubMetrics metrics;
+
+    @Mock
+    private HttpServletRequest request;
+
+    private GlobalExceptionHandler handler;
+
+    @BeforeEach
+    void setUp() {
+        StaticMessageSource messageSource = new StaticMessageSource();
+        messageSource.addMessage("error.request.timeout", java.util.Locale.getDefault(), "Request timed out");
+        ApiResponseFactory responseFactory = new ApiResponseFactory(
+                messageSource,
+                Clock.fixed(Instant.parse("2026-03-20T00:00:00Z"), ZoneOffset.UTC)
+        );
+        handler = new GlobalExceptionHandler(responseFactory, sensitiveLogSanitizer, metrics);
+    }
+
+    @Test
+    void handleAsyncRequestTimeout_shouldReturnNoContentForSseRequests() {
+        when(request.getRequestURI()).thenReturn("/api/v1/notifications/sse");
+
+        ResponseEntity<?> response = handler.handleAsyncRequestTimeout(new AsyncRequestTimeoutException(), request);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.NO_CONTENT);
+        assertThat(response.getBody()).isNull();
+    }
+
+    @Test
+    void handleAsyncRequestTimeout_shouldReturnApiEnvelopeForNonSseRequests() {
+        when(request.getRequestURI()).thenReturn("/api/v1/publish");
+        when(request.getMethod()).thenReturn("POST");
+        when(sensitiveLogSanitizer.sanitizeRequestTarget(request)).thenReturn("/api/v1/publish");
+
+        ResponseEntity<?> response = handler.handleAsyncRequestTimeout(new AsyncRequestTimeoutException(), request);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.REQUEST_TIMEOUT);
+        assertThat(response.getBody()).isInstanceOf(ApiResponse.class);
+        ApiResponse<?> body = (ApiResponse<?>) response.getBody();
+        assertThat(body.code()).isEqualTo(408);
+        assertThat(body.msg()).isEqualTo("Request timed out");
+    }
+}